Bantams are not going to make money. Bantam breeders keep them for fun and showing. If you show a lot and have really good results, you can command a good price - for a few birds, but there is not much market for bantams in bulk quantities. People aren't using them for egg production, and certainly not for meat production. That leaves the pet market, and the number of people who are allowed to have chickens and want bantams is far less than the number of customers you will need to sustain a business.
I know about this first hand because I hatch and sell locally. For every person looking for a bantam (always cochins or silkies) there were 50 looking for LF laying pullet chicks. I have both bantam cochins and silkies, but did not hatch any all of last year, it was simply not worth it, I can make more money in much less time with LF. And the few people that contacted me asking to have chicks shipped? Zero wanted bantams. If you don't need to care about turning a profit and are counting your labor as free, then go with whatever you like, bantams or LF, but if you want to have any chance of making money, skip them (and all specialty fowl - ducks, gamebirds, turkeys, quail) and focus on a few really popular LF breeds.