lol I use one and two gallons, but the one gallons are mainly medication containers (like for fin rot, or something, using AQ or EP 1 tsp per gallon method, every day cleaning :) )
And geesh if I owned a pet/fish store, I'd not even sell bowls. Don't care if people would say "make money that way" I don't care lol. I've already told my friend the two danios she got would not fit in a 1.5 gallon, especially with a betta. So I am making her cycle her 10 gallon tank :p then she can have 2 more, and a betta, with hiding spots.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.