My take: I like the idea in general. I do have concerns about the gathering nodes and facilities. I think to stave off abuse, they should be available to only the home owner, and the gathering nodes in particular should have a respawn timer between uses. Maybe once per hour. I'm not sure if it's a good idea to allow more than just basic crafting facilities for free, but I could possibly warm up to the idea.

The only problem I see with my idea is when multiple owners exist. I suppose in that case it would be prudent to have a house deed as a key item, which can be copied and given to a certain number of players relative to the "level" of the house. For example, a basic level 1 house could have 1 owner, a level 2 could have 3, level 3 could have 5, etc.