Multiple Correspondence Games

I was wondering if it even makes sense to play so many correspondence games at one time (such as 10-30).  Surely this many games is to much.  Opinions will be appreciated.

I like to have 20-40, other people like 1 or 2. Different strokes...

Wouldn't so many games take away focus?  I would think that players with at least 10 games going would be underperforming, but I don't really know.

I usually keep the count at 10. 3-7 days per move x 10 games is enough for me. However, now I got into a tournament and got over 10 games, which is unusual.

Depends on the time/move value. If it is high enough (a couple of days for 1 move), you can safely challenge more opponents. If you play just 1 move/day, it can be frustrating to have that many games. I usually do 3-7 days/move and I don't find disadvantages of having 10 games going on at once. I spend 10-20 minutes on one game, then move onto the next. I don't think very much, unless it is a very complex position that requires a critical move or tactics.

Idk, I know that I can't stay focused for that many games...

My guess is everyone is different.  My ideal number is 6, though anywhere around up to 12 is fine.  

In spite of this I recently started a boatload of games (60+) because I'd never done it before and thought it would be interesting and fun - kind of a mind sports version of running a marathon.  It has been both interesting and fun.  To be honest, its surprised me a bit that I've been able to retain in my minds eye the direction of play that I'd been thinking of when returning to several of the games (granted at my level not really looking all that deeply into the positions) as long as I cycle through the marry-go-around at least twice a week.

Its a very different feeling, obviously, then playing a bunch of live games.  Not likely do it again (at least with chess) but I'm glad I did this time and would recommend every turn-based player give it a try at least once.  If you feel so inclined.