I wrote a patch to remove it last december. My unwritten argument was that the monastery can be confusing enough to a newbie without unnecessary banners. There are no longer any new quests posted, and the poll ideas quest concerns only a few monks and they can find it from How do I create a Poll?, we should not advertise this quest with a banner on the front page.
Corion has applied the patch when as a reaction to this thread I have pointed out that the banner can actually confuse monks.
Honest, I think it really was kind of confusing, or at least distracting. Context is a funny thing, and the 1st time I encountered your (former) banner mine included alot of poking/messing around with various Unauthorized/BlackHat editions of Windows XP. I'd just left a short-term contract with a firm that was running into problems because they refused to adopt Windows Vista. When I saw 'Mega XP' I thought to myself 'Wow! XP in Perl?' And my (unrealistic, I guess) hopes really were dashed.