The revised unreal engine 3 with the UDK has many nice features that UT3 lack. I think updating the game engine would significantly increase sales.
Based on other user's experience, porting ut3 content to UDK is not difficult,
from tactical assault team
"As it turns out, porting to the new UDK was relatively painless and we now have our Alpha build running independent of UT3 and in pretty good shape. And, as an added bonus, the UDK makes everything look a whole lot better!"
from the haunted team
"This version is the last release as UT3 mod.
Our next step is to port it to UDK, release a demo and evolve The Haunted into a standalone download title."
porting ut3 maps to udk
even ut2004 content
so porting difficulties can be ruled out as a reason why epic will not port ut3.
so what's the rationale for those that don't want it ported over?