Empowering an empowered spell, can you?

[Nyeshet]

Actually, it is NEVER achieved by anyone without a houserule.
BAB stops at level 20. You gain an Epic Attack Bonus that stacks with BAB from then on, but BAB never rises above +20/+15/+10/+5. Your 35th level character, by the book, has +28/+23/+18/+13 (BAB of +20/+15/+10/+5 and Epic AB of +8 applied to each).

Since my campaigns have never gone far into epic levels, I've never used the "official" epic rules. I still can't believe they allowed such poorly thought out rules to become SRD. Consider a Wiz 20 / Ftr 20. You would expect this to be equal in power to a Ftr 20 / Wiz 20, right? Nope, by the "official" epic rules a Ftr 20 / Wiz 20 can crush a Wiz 20 / Ftr 20 into pulp any day of the week. Not only is their BAB different - their saves are not even the same!

Anyway, I - and every DM I personally know - use a continuation of the normal rules into epic levels. In the end the only difference it makes is number of attacks, how poor a save is (since - by the "official" rules - all classes gain Monk-perfect save progression for all saves upon gaining level 21), and a few other minor things. As has already been stated above, the number of attacks has never become an issue, having never reached more than six per round - and that only for a single PC (at least in my campaigns; for some DMs I know it has gone higher).

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All this is a side issue, however. Let's get back to the purpose of this thread.