Hi - new member... I'm the same, used to love watching Tim's vlogs around the parks but have stopped watching them these days since Jackson came along... only because the whole 'family vlog' they've become is not my thing.
I would say though, that your comment about 'the love of the parks' made me reply to your post in particular.
When I first started watching Tim's videos, it prompted me to watch some of their old videos (before their purge), and it seemed pretty clear to me from their first Disney videos that they weren't fans of the parks - they were with friends, didn't know character names and kept telling you how to grift free stuff. Also they had zero Disney merch in their house or clothing etc. I'd say they realised the Disney vids were getting big views compared to all their other content and concentrated on that.
But, you know what - good luck to them, they found the niche in the market when it was in it's infancy and ran with it.