This makes sense to to me. So the volume is close on bitstamp because that is where people are going to actually move money in/out of bitcoin, while all the day traders are sitting on gox. Anyone buying bitcoins would be crazy to wire to mtgox instead of bitstamp. I had a look at the order books, and bitstamp has about 5000 coins on each side within $10 of the current price. Mtgox has 20-25k coins on each side. So that is some 4-5x deeper. Still, the trend is moving towards bitstamp.
At the moment are 93,768฿ and 13,428.655$ in Mt. Goxs order book. You have to use full depth, e.g.:
https://data.mtgox.com/api/1/BTCUSD/depth/fullThere's probably a lot more money on Gox. But what is in the order book is definitely there.
What safety deficiencies are you talking about?
You have no API keys. You always have to use your password that gives you full access to your account. Even for a bot, which runs on a dedicated server.
You have no hardware tokens (YubiKeys e.g.) for the 2FA. Only the Google authentication with your mobile phone.