Op Actually it depends on how much you are ready to gain and how high you are ready to take risk. Both things are interrelated to each other. It's true that profit could be huge but are you ready to lose $1000? Maybe you are but not everyone is gonna ready to lose as $1000 is still a big amount for many people even me too. Otherwise there's no restrictions for them who would like to take risk and play with those shitcoins. Your last question answer is same, 5 memeocin wouldn't scam together but wouldn't pump together also. You may profit or may loose but yeah, there is good possibility to making short term profit from those during bull run. apart from that, for uniswap, you need ether for each transaction and for pancakeswap, they required bnb for each transaction. No matter how big the exchanging amount is but fee is same. Yeah you can exchange anything with other token or you can have usdt dai  usdc but for that , those dex required eth or bnb. That's why cex is better for many reasons