i dont have a problem with bettas in cups so long as they are maintained. i understand it is impossible to keep store bettas in the appropriate tanks because it is far to expensive and impractical. my objection to walmart and similar stores treatment of the fish is not the size of the cups, but the lack of maintainence of said cups.
My Girlfriend and I have these Bettas
Wannahockaloogie-Male VT-Blue w/ purple tips.
Mist-Male CT-Dark Green/Blue.
Kitty-Female Delta-Purple Cambodian
Nala-Female VT-Orange Cambodian
Hippie-Male CT-Red, White, and Blue Dalmation
Puddles-Male CT-White w/aqua fins and light red tips