Hi vlom,
Isn't that risky to hold money on an exchange? I lost a couple of BTC on MintPal, and almost lost some money on Cryptsy (had to sell coin for Doge at a bad price to get out). Since then I try to never keep money on any exchange (even if it's supposedly safe, like poloniex).
It is very risky to trust any one exchanger totally, its better to hold all bitcoin in different exchanger and you can sell them whenever you like and with this you can also do arbitage trading in different platforms.
Agreed. Keeping Btc in one exchange is very risky. It locks up your money. Better to hold off the BTC among different exchanges.