Post-yolk silvers are the best part of 100 bucks around here.
5&6" are over 200- and they sell like hot-cakes. Every chinese restaurant has a 100 or 150Gal with 2, then 1, then none, then 2 new ones, then one, ...etc... They kill each other or jump or otherwise croak after a couple of weeks/months. Long-term husbandry isn't a big part of the programme. I keep thinking there might be a few bucks in tank-maintenance around here.