The following comment was made on a recent posting. I was going to answer it in the comments thread but decided it needed a wider reading. The yeshiva tuition crisis certainly needs addressing and we need to think outside of the box, but outside of the box may not cost less then inside of the box, in many ways.
Don't want to highjack the post, but if you can't afford the tuition don't send your children to yeshivah. There are perfectly good Public Schools. And with the money you save off not paying tuition, you can hire a yound rabbi to tutor your children. If that Rabbi charges $50 per day, you will spend a total of $12,000 per year to educate your children. If you combine with another family then your expenses became 50% less. Imagine all four of your children getting Jewish education for $6,000.
Theoretically your comment has some validity. But in practice it won't work. For one thing, the rabbis who tutor are making $50 an HOUR and up. Do you really think they will suddenly settle for $50 for 3 or 4 hours instead?
If you have children of differing ages and sexes that one rebbi for all of them at the same time now gets complicated. He would be expected to teach, let us say, 4 children with differing amounts of knowledge and with differing chinuch objectives all at the same time, giving equal attention to all four, and for only $50 a day, or even $50 an hour? Not going to happen. I would imagine that most rebbis would balk at teaching both girls and boys in the same educational setting, particularly as they get older. You are now in the position of hiring two rebbis--one for your sons and one for your daughters. Or maybe a morah for your daughters and a rebbi for your son. Welcome to complication land. Women who tutor limudei kodesh subjects are on par with rebbis as to what they charge, or fairly close to it.
Also keep in mind that the rebbi with the right aptitude for teaching very young children may not have the aptitude for teaching older children and vice versa. And the younger that rebbi, and therefore, perhaps, more willing to take less money, the less experience in teaching.
And once it is obvious that what parents are trying to do is reduce tuition payments by banding together with a few other parents for after public school learning, rebbis are going to raise their rates by a lot. After all, what are your alternatives? You can pay $10,000 to a yeshiva or you can pay $5000 per child taught to the rebbi. You can't claim that he should charge less because he is teaching more kids--he would do the same in a regular yeshiva classroom.
Look at the figures this way: $10,000 for a 10-month school year in yeshiva or $50 an hour for 12 hours a week, being $600 per week or $24,000 for 40 weeks of instruction. That is per child. Find a rebbi who will miraculously work for $25 an hour and you are paying him $12,000 a year, per child. The more children involved, the higher the figure, not the lower.
Even using your figures, let's say you get 5 children together. That is $25,000 to the rebbi. Is that a living wage? No. So the price will go up. After all, he has the same expensees that you do for supporting his family, including hiring someone to teach them while he is busy teaching your kids. You would have to have a full classroom's worth of kids to be able to bargain with that rebbi and get the price down. My house is fairly large, but sticking in 15 to 20 children into it along with all the teaching equipment on a regular basis is not going to happen. Then there is the insurance question. If you are running any kind of class with regular attendance and something should happen to any one of them while on your property, you would be liable for payment, or at least your insurance company would be. And if they should find out that a regularly scheduled class is taking place, your insurance would go way up. And they could require you to have a physical set up with at least two exits, among other things, before giving that insurance.
There is also this. Your kids come home from public school at 3:00PM. They need at least a little time to unwind before you sit them back down to learn. So let's say they begin limudei kodesh studies at 4:00 PM. At three hours of study that makes it 7:00 PM before they are finished learning. Supper for little ones at 7:00 PM? And when will they do homework for this double program? How about a bath? When will they go to sleep? And how about plain time for playing and reading and just relaxing? Make that only two hours of study and you still have a time crunch and a lot less learning going on. Only one hour of limudie kodesh studies a day? Just what will they be learning? Not the equivalent of a yeshiva education by any means. So now you are faced with school on Sunday as well to make up the time deficit. Now add in more money to the rebbi for those additional hours.
In short, looks nice in theory but very difficult to put into practice in a practical way. It's a question of supply and demand. When an item is highly desired by people the price goes up to whatever the market will bear. Hiring a private rebbi may look good on paper but there are lots of other considerations that make that bargain less than a bargain.