With regards to the higher levels making alts, there is also the issue of 'weight of experience.' Its something that people listen to, and its something brand new characters rarely have.
Playing a higher level in Vallaki is akin to taking on a mentor role. For example I play one there that teaches two different PRCs to players who wish to learn it. He also teaches about various creatures and beasts at large in the area. He also strongly reinforces the setting as best he can by firmly reminding people that they cannot win every fight, that many die and are lost, and there are never any happy endings in Barovia. He's a walking monument to pessimism to counter all the innocent cheerfulness.
Now, I could make an alt for this sort of thing, but frankly that would be cheesing as hell. The character in question is able to do those things because they spent years learning it all, researching it all. By making a new alt, I would need a fresh outlook, and lack all that IC knowledge. If I tried passing on prc training or monster lectures on a level 2 or even a level 5 or 6, I'd rightly be pulled up pretty quick.
I'm fine with the changes, even though it was my only xp gain these days. Limits the growth but eh, what can you do.