Do people just keep their coins on Cryptsy because they don't feel like syncing a wallet, making a password, and backing it up? It's so easy

I know it's not the withdrawal fee, that costs $0.0005.
I feel like Cryptsy is quite secure, hopefully all Unobtanium holders are smart enough to at least use a different password from other accounts & 2-factor authentication. The problem is if the cold wallets of Cryptsy are compromised, or if the government shuts down cryptsy or it isn't liquid; 20% of all UNO would be at risk.
When Bittrex updated a couple months ago they added a cool distribution figure. 1 account on Bittrex has 1,400 UNO

If you're one of the people with hundreds of UNO on Bittrex: Why haven't you downloaded, encrypted and backed up a personal wallet?
It's hard to tell how much of the UNO holdings on Bittrex are in sell orders, they don't offer an UNO y-axis on their order book, but there's 25 bitcoin to a price of 0.1. Cryptsy has 500 UNO on ask only up to 0.012. It's quite frustrating that they don't allow you to see deeper into the books.
Sigh, I don't know guys, it all just seems strange to me.