I think we shouldn't have an upper limit.
Since we really don't know when she (priya) will be posting her question, i think everyone has a fair chance to win. Moreover we have enough people trying up for it.
Also even if someone is winning straight 7/7 someone might come and break his/her winning streak, it gives a challenge to the winner and others, its not the $ but that winning streak that one wanna make, be it saswat or anyone.
Its like saying when australia was on a winning streak, winning every match, and banning them from winning the next match.
Let it be a challenge, someone winning all the time also has a threat that someone will come and break his/her record. It's not that easy to win all the time.
Thats where the fun. Thats what competition is all about.