SMS confirmation ?!
fuck that holy shit do you think I am made out of cellphones and time

I say just fix the problem and have the website run as it normally does with the normal fees and use the money you make from fees to fill in the 12.3% gap
I don't see why we can't have poloniex operate as a fractional reserve exchange, even temporarily. Every other exchange is fractional reserve, this shouldn't even be a problem at all.

Unless 87% of the BTC in your website are withdrawn really fast regularly I can't possible fathom how this could even be a problem, something is missing here.

I think poloni.ex operated as a fractional reserve exchange and this 12.3% WAS their fractional reserve, maybe.
That would explain why this problem didn't get solved in 5 minutes and an apology.