I have no idea...but it would explain why someone would feel comfortable with that amount on there.
Well shucks, this is information about MyBitcoin I did not know.
This service shows the name MyBitcoin LLC and a mailing address in Nevis. It is not known if this truly is an LLC and if so, where the organization is located. There has been no member of the Bitcoin community who has claimed any affiliation with MyBitcoin.
Interesting. I'm surprised the site gets used so much, I have always read negative things and just choose to wait for a more, or any information, regarding the owners now (is it BRUCE http://forum.bitcoin.org/?topic=3597.0