Have no auditors who can prove all this virtual Bitcoin trading on exchanger backed by moneyfull private keys.
and you also have no proof that they aren't backed by anything. so you are just trolling.
When people start to windraw Bitcoins from exchangers MTGOX2 will happen.
nonsense. MtGox went down for many different reasons not because people withdrew. you need to check the history before making statements like this.
So better keep your Bitcoins outside echangers for safety.
https://electrum.org/ if you can not use bitcoin core wallet.
off topic here despite being true.