There is one thing I'm not sure I got: pawns already don't have access to charts. When you say remove us from the charts you mean remove us our rating position with relation to others. We just get to keep a ranking, not a rating, is that it?

Pawns will also loose some competitiveness. Comparing yourself to others is a very big incentive to try to play better. So you'll risk diminishing the number of pawns on this site that are here just for the competition and that usually make good opponents.
Also, I bet some paying members would prefer to compare their position in a universe of 10000 players rather than in one of 1000.

Another thing: what will happen when a paying member stops paying? disappear from the charts? Or when a pawn that has already an established ranking finally decides to become a paying member? Suddenly show up?
Ratings might become a bit more unstable then what they are already today...

Of course, it would also diminish the time I spend on the rating listings, comparing myself to others ;)