Even though the actual number of AFOLs is low compared to other demographics, the amount spend on lego, I assume, would be a higher percentage thus the UCS sets. Even though it's 5% of the market the profit from AFOLs would be significantly higher. It is according to my wallet
I've been collecting non-stop since the mid seventies (yes, that makes me old), and I've definitely seen a change in the way Lego has marketed their product. I remember speaking to an AFOL in the 90's who had visited with the Lego company. He basically said they were interested in what and why he was purchasing, but he still felt that there was a perception within the company (or at least with the people he saw) that AFOLs were a little off their rockers.
I think it's pretty clear with the amount of $150 plus sets and licensing, the TLG is actively pursuing the AFOL market as well as the collectable market. LotR was definitely not going to be happening in the 70's, 80's or 90's. So while they may or may not still have that perception, at least they are catering to that market.
and oh yeah... I definitely spend easily 20 to 30 times more on lego than, per se, my pre-teen cousins. So I do kind of expect to be catered to a little.