Smaller customers normally do not get ripped off as they are the bait for the big fish, do not forget that. Every time one of these sites gets hot the owners get greedy and since there are way more fish then whales the GOOD comes out with only 1/100th of the people being scammed then outed.
Hrmm... While I see what you're saying, I'd likely be considered "big fish" on Coinbase and haven't had any issues at all.