Remember, this is the NCAA talking about wanting to expand, not the individual power conferences.
I don't think the NCAA cares who the extra 32 teams are. I think they feel they'll get the same revenue no matter who they are.
Back to that .500 conference record thing......2 things:
1) If a conference has a really big year, you're actually punishing it by having teams good enough that won't qualify. Yes, we all know about the mid-major injustices, but there can be power conference injustices too. Just because mid majors get screwed doesn't mean majors should get screwed too.
2) The Law of Unintended Consequences. If we set that rule, you're going to basically give a free pass to EVERY team that finishes at .500 or better to the NCAA tournament. All of a sudden, Virginia Tech and their flaky 10-6 mark get a free pass and gets them heralded. You know, VT's 5 opponents they played twice were the 8th, 9th, 10th, 11th, and 12th best teams in the ACC? Several ACC members went 9-7 in league play, and their 9-7 was more impressive than VT's 10-6.
The point being, banning all sub-.500 teams actually means letting in every .500 team or better, which actually means MORE power conference teams get in.