Is there any benefit to a Use Magic Device modifier over 27 for a Warlock? It seems like the maximum check you would ever need is to cast a level 9 spell from a scroll, which is 20+17. Am I missing anything, or is that the hard cap to the skill (since I don't care about deciphering someone's spellbook)? For example, let's say there is some scroll that you must be evil to cast, and I'm chaotic neutral, and it's a level 9 spell — the alignment check seems to become unimportant because the check to cast the level 9 spell is higher (30 vs 37). Since I can just take 10, then if I have a 27 modifier, that's pretty much endgame for UMD. Am I missing anything?
It seems like it would be more fair if the difficulties somehow combined, but that doesn't appear to be the case. Because of that, I just wanted to make absolutely sure I wasn't missing something.
(warlocks can take 10 on use magic device after level 4)