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?
If you hold the U.S. dollar, it is just a way to preserve the value. It will not bring profits. If you hold the bit, then there is a big chance that you can bring huge profits. Therefore, it is not recommended to change into U.S. dollars.