I personally have bought quite few, usually the Ethereum based ones mostly do good. Had some disappointments though. Wasn't very successful with the wave based ones ...
What about you ?
I haven't tried to buy coins or tokens before, because it's really hard to decide whether which is good to buy. There's a lot of altcoins there and it's really hard to speculate which is worth keeping and investing. I just earn my tokens and coins for free from signature campaigns. And so far, I've earned good money because of it.