I dont know what you mean about "Poor altcoins" considering that you had mentioned an incredible market cap but somehow you can eventually check out if those are organic ones or just
simply get those stats or numbers for a single pump out.You can spot it on your own.

Lets say that they do have that real big volume.Those coins arent considered shit though since there are people who do trade of with these coins and the thing you've been asking is
about arbitrage.

Yes, its possible but be sure that you should be fast on executing action between exchange so that you wont end up on negative when the price of that certain coin you've been trying to arbitrage
wont drop when you are midway. It looks to simple but there are lots of things that you should consider to be profitable.