It would obviously mean that some of them would end up being failed shitcoins, but the upside potential could be life changing financial freedom as well. You can't really expect 500x parabolic rises from current top marketcap coins unless obsene amount of more money would be poured into them.
I doubt a casino will list under 300 marketcap coin, because low marketcap means it also low interest/holders (except their own coin). I think it's more like an trading advice by buy shitcoin and wait until 100x gain, the purpose of add coin on casino is for playing not as investment.