Why are altcoin exchanged for btc and not for dollar?
having tons of altcoin is just like having bitcoin. If bitcoin grows, they grow. If bitcoin falls, they fall.
Isn't this pointless? Why not buying and selling alts for dollar?
To answer your first question - exchanging altcoin to btc (and vice versa) is easier for exchnages to process because they don't need to deal with fiat money. "
Having tons of altcoin is just like having bitcoin," it is not exact. Crypto market as general shows positive correlation to Bitcoin, but single coins tend to behave differently (pumps before forks, dumps after news etc.).