Yeah true, but then a few bucks to adults may not be a problem and it could be cheap thrill for their kids. But imagine the disappointment when they are like only 1 cm big and all they do is to swim around doing almost nothing and interacting with microscopic stuff...
WHAT??? You mean they were not monkeys??
I saw that once too, it was tempting but then how is it possible for them to live in as little tank without chnaging of water and stuff like that?