I'm not sure what that would accomplish, other than more hearsay. I think the only way that we'd ever have a true answer would be if Innova and Discraft released their sales figures, which I'm not going to be holding my breath on. Out of curiosity though, I did google Ultimate forums, and the two top hits have these figures:
ultitalk.com
Code:
Users Online 13 Guests, 0 Users, 0 Users in Chat
Most Online Today: 27. Most Online Ever: 341 (July 03, 2012, 01:50:09 AM)
USA Ultimate
Code:
Currently Active UsersCurrently Active Users
There are currently 44 users online. 0 members and 44 guests
Most users ever online was 320, 04-22-2011 at 12:24 PM.
Compared to DGCR's:
Code:
Currently Active Users: 330 (81 members and 249 guests)
View Who's Online
Most users ever online was 2,608, 01-04-2015 at 09:16 AM.
Just arbitrary data, I know, but it hardly lends credence to the notion that ultimate is that much bigger than disc golf.