How many tables do pros play if 6 tabling? Can't imagine you can play that many tables at 6 max compared to 9 max. The issue is you cant find much 9 max cash games any more full ring online.
I used to prefer a full ring and you have to be able to get by like that in a tournament where the tables stay mostly full online ... but here, in cash games at least, where I play brick and mortar and, it's hard to find a full ring so it it's effectively 6 max anyhow, so this is what I have concentrated on trying to improve upon mostly.
In live tournaments here the tables are 10 seated although they are rarely full, I think they do that for late reg purposes but not entirely sure, although I feel there is less variance playing 9 handed, and probably a much better place to start for newer players .. as someone else mentioned you won't blind off as fast in a full ring, I guess people like the action on a 6 max more ....but I have never seen a shortage of full tables online in a tournament, at least until the tournament goes way deep.
As far as the pros you look at some players like Nathan Williams and he was playing like 24 tables at a time in micro cash games online haha that's kind of insane to me, most I will play without totally sucking, and not being able to keep up is 4 .... of course no pro here : ) that goes for tournaments for me too ... I just can't keep up with more