I remember half year ago(or maybe more) one player came and it was sick to watch his game, he wagered 30000 bitcoins(not sure how much of that was on plinko but i suppose most was), he took cca 100 btc(or was it on dice? not sure, it was long time ago) and investors were pissed. His one bet was looking like my monthly salary, sometimes even more. Crazy guy.
edit*
Sorry, luckybit, if info at site is correct(108K bitcoins wagered) they are number one plinko site.
agree with ralle14 because I checked out luckybit and they are quite dead because of on chain bets. I dont know why they dont change to off chain.