How they can be incredible if they are poor altcoins? Well, I mean that those descriptions are contradicting how you describe it. Going on, it's possible to short from another exchange to another.
I think what he meant is Incredible Volume so poor in value because so far it is Rpple (XRP0 who's having huge volume but stays in top 5.
Yes, that could be it and I understand it better now.
Do you mean arbitrage trading? it's possible and it's been done by many traders if the spread from the other exchange is quite high and you can see the potential profit. But, there's also a chance that you might be rekt if done it slowly and wrongly.
Well arbitrage is still profitable if you have experience,because all you need to do is watch each exchange and transfer your funds from each other that has High in value.
It's profitable if you have been doing that most of the time. But not every single trader can do this accordingly as we say that it's profitable. There's still more chance of losing on this strategy because delays might come and that's going to destroy your strategy.
Well, I hate to be the bearer of bad news but arbitrage trading is not working on crypto market 98% of the times because of a few factors that make it impossible, in theory arbitrage trading should work in crypto because the difference of the prices between exchanges is quite high but when you test it out yourself you will be facing many problems and that tells you it's not as easy as it looks, one of the problems is fake volume and fake orderbooks and bot trading, trading bots of these exchange only sell to or buy from themselves and will disregard your order if you want to get the best price(be the market maker) so you have to pick an order from orderbook and sell to or buy from that which means you will not be buying and selling in good prices that it shows on their exchange or on coinmarketcap.
It's not actually a bad news but it's the reality that you are telling. Arbitrage works for some and most for not and in that case, those few traders that are working with this strategy keeps on using it because they know what to do and what are exchanges that are good applying it.