Luckily there are not too many Clients that want a super Loud master in my area.
I am quite blessed that I mainly deal with mixing engineers, so I guess they are aware, that their mix will suffer.
Usually they are happy if a rock n roll or pop mix averages around -10 db (which is still loud, but enough to retain the feel of dynamics)
The metal bands are even more aware of the loudness war and they actually ask for dynamic masters. i think a couple of well respected mixing engineers here in Thessaloniki did a great job informing them, about the downsides of extreme loudness.
Funny thing happened last October, when I finished a master (acoustic instruments, nice melodic music) and was evaluating it with the client (mixing engineer)...
He said nice man, great imaging ,tight bass, blablabla...now go back, make it a couple of dB's quieter and burn the master CD.(The "test" master was averaging at -13db and the final at -15)