Throwing 20btc in this will do basically nothing.
I mean there are ~250Btc outstanding. If you invest now, you will not get anything unless people pay 250btc in 3 days after you. Not gonna happen.
20btc would lower this to 230btc so no big difference.

This is a ponzi scheme, only early Investors win, late folks pay their profits.
This ponzi is milked for at least 48 hours already.