You're right. I will often sit out a round or two of qualifying to relax and get ready for the mains.
At the local level, with smaller fields and bumps up into the A-mains, if you're good enough you can work your way into the A-mains if you have problems in qualifying.
3 rounds of qualifying is too much, IMHO, but if others want it then that's OK. I don't see the thrill of round after round after round of qualifying. If you can't get it done in a couple of rounds of qualifying then it's not your day.
The other thing that gets me is when somebody, who has been blocking me for the entire qualifying session, turns to me and says 'good race, buddy!'. I just want to push them down the driver's stand stairs. lol... Dude, it's QUALIFYING. If someone catches you, let them by.
The ONLY race that matters is the last one. And that's what I focus on.
Mark