Over the last 12 years I have sold 2288 fry/juveniles for $5274 Canadian. That sounds like a lot of money and a bunch of fish. But it works out to only $2.31 per fish (about $1.75 U.S.) and under $37 Canadian a month and only 16 fish per month.
These fish are all African cichlids. Prices ranged from 75 cents each up to $10 each. Lots of yellow labs at a buck each keep the average at $2.31.
I have "sold" fish a few times to local pet stores but they only give credit not money. Mostly I do not do it much at fish stores as it is a hassle. You have to be there when the manager is in, then they see the fish and don't want them or want to pay less.
I advertise on-line on a local sell everything and anything website, as well on a regional fish forum.
I do not do this a business and I do not make money or a profit. But $37 a month average thus far has paid for food for fry and the electricity/water costs each month for my fry tanks.
If I figured out the time I spend each month catching holding moms, stripping, moving fry from tank to tank, placing ads, cleaning tanks, cost of replacing worn out filters, messing around with tumbling eggs on occasion, waiting for people to come buy to pick up fry - all to get $37and barely cover my costs - my pay per hour would be nothing.
So again, I do this because I enjoy breeding tanks and seeing fry grow. A little money supplements my hobby costs and that is it. No different than the hobbyist gardener who has a greenhouse and sells a few geraniums or tomato plants each summer. If I were doing this as a business for little money it would take the joy out of it.
I have given away a few fry from time to time. The main reason I do not is that I feel most people, if they pay a little, no matter how small, will take care of something better than if they get it free.