Breeding is a fascinating thing to do for sure, but I think what everyone is getting at is - are you prepared to take care of the fry till they reach a mature enough age to be adopted out? You could easily end up with over a hundred baby bettas. They will need clean water, appropriate food, and as was mentioned before, they will eventually need to be separated into individual containers of some sort. Do you have 100 people that would be willing to buy your bettas and take good care of them? Just remember that they are living creatures and not toys. This undertaking shouldn't be taken lightly - it can very easily get overwhelming!