Visit
www.pokerpulse.com
They list 2350 Real money ring tables,
17709 ring game players
20438 tournament players
All real money, as the peak for party.
If you drop the number of hands to say 55/hr and set average rake at something more like .65-.75 I think you will probably get a more accurate value as most of the tables are at the lowest limits and you also have to make up for the hands that are not raked (or in NL, that are raked .10, .20, etc)