Not really sure Cryptsy had anything to do with the price dropping. Though it did spread the volume out. I have seen at least 50 different coins
that got listed, shoot up in value as soon as they were listed. Then drop in value shortly there after, I suspect it has to due with everyone wanting
to get a piece of the action. And my observation is this happens at other exchanges as well. I usually wait for the hype to die down and if I see if I like it has some potential, then I buy some.

As to whether or not Bittrex or Cryptsy stake the POS coins, I do not know? If so you should put them in your wallet and stake them yourself!
Some exchanges take some of the coins for themselves as fees, not much difference to me. They have to make money to pay for the infrastructure, maintenance, help, and other overhead. Some I buy are strictly for trading aka non POS coins. I buy POS coins because the average
person can mine aka stake coins on their computer without having to buy mining equipment, which gets outdated quite quickly, sometimes in just a few months. Plus hope the mining pool they joined, don't take off with their coins they mined. I hear that happens alot! I have several POS coins.
Community, Mint, Zeit, Hobo Nickels, Bottle Caps, Truck, HyperStake and TEK. I bought into TEK at 25k, I could have dumped them when the price dropped. Instead, I bought more! Same thing I do when the others dip in price too. With TEK at 3.5-4k, now I can buy 5 coins at what I paid for 1.
I am not in this for the short term, I am in for the long run. Every time my coins stake, my cost average goes down. WORKS FOR ME! When HYP went up in October I sold 10k for between 8k-10k. Worked for me as I had bought them back in July for 375 satoshi. Paid for a lot of coins in my HYP wallet. Moral of the story do not put all of your coins in one wallet and have some patience! HyperStake has an excellent community! I think I will hang around for a while! I have been learning a lot about alt coins, wallets and POS staking.

Peace!
Dennis