What does the exchange care? They get fees for a while while it is hot, and if they end up delisting it, then they do.
I agree that extreme churn is annoying for everyone but I doubt ETH trading is going to head toward comatose very soon. I could be wrong though.
Ehhh I agree to an extent. I always felt adding coins that didn't last as a sign of a non premium / secure exchange (I feel safer with bitcoin in coinbase than Polo & I felt safer at Polo than Cryptsy). A reputation type thing? Still convinced that the issues surrounding bitcoin are the drivers for this massive volume - not Ethereum innovation otherwise we would have seen a lot more volume before now.
*Grumbles* Even bitcoinwisdom hasn't added it yet.
BTW ... how do we get invited to this private group chat