I kept mine, bred mine, and recieved tons of compliments on their vivid colors, full finnage, and all around health. I kept them in 1/2 gallon betta cubes or slightly smaller betta hexes. They stayed in my room which was kept around 70 degrees, had regular water changes, and they all lived full and productive lives. Some of my females were some of the most colorful and productive egg-layers in my area at the time and were often mistaken for short-finned males!!
Say what you want about betta keeping and how they require this and must have that. Some of us do just fine doing what we do with what we have. *nods*