every day there are new coins, do not be lazy to read announcements and choose algorithms that are suitable for your cards.
yes, but there is no warranties those new coin is gonna make to the exchange, right?
and even if they do, the price could be bad..
but if everything goes smooth, this will worth the risk, usually return are good

everybody will happy. ZECminers - needn`t risk, shitminers - competitors are out.