I don't know if it'd make sense, I'm just throwing it out there.
Everybody on vb.org thinks they're a developer, a yearly xenforo developer license would instill a little more trust to users that the xenforo developer is serious about supporting their product, possibly.
This license could include some database/forum tools to easily create builds, test scripts, image packs, insider knowledge, reseller bonuses(?), etc (?), but how you'd keep that limited to just license holders is beyond me.
I'm just saying that I'd support a paid for developer program, as well as having the ability for anybody to create a mod/app/hack for the core project.