Well, I'm pretty familiar with the top tier offerings on UA/AA/DL/US, having been top tier on all four of them. I'm currently top tier on UA/AA/DL.

The answer is that the benefits aren't all known or published at AA and UA. There are a lot of wonderful things that they'll do for you if you just ask them.

I'd suggest you go over to each of the other boards and post there. For instance, on the AA side of things, FewMiles has a great unofficial web site with all the info on the undocumented AAdvantage perks.