why?
why are you mining at that url it is not really btc it is btc classic a different coin. and you get paid in btc.
So f2pool is speculating that one day they can make btc classic valuable.
Basically you are digging in a copper mine (btc classic) and being paid from a gold mine (btc)
so if copper ever goes way up in price the owners of the pool score since they pay you in gold.
The reason why you made 7 blocks is no one mines that coin much at all so blocks are easy to earn.