I don't think there is a point in doing that. Those who sells botting services would just make a script that creates basic and premium accounts and it would create new basic accounts every third month.Okay, so reformulating my idea, could MFC change the algorithm for listing the 10 "most popular rooms" on the sidebar based on the number of premium and basic users in the room? Completely ignore the guests in making that calculation.
If you weighted premiums as - for example - five times more valuable than basics, your rating would heavily skew towards rooms that attract premiums.
People could still game that system by creating lots of robot basics, but it just makes it a bit harder. MFC might fight against that by removing from the calculation all basic users who are registered three or more months without ever buying tokens....
I'm not arguing for or against anything specific. I am just saying that in general MFC could make it hard to scam the system.