I haven’t started using it yet, but no, not at all. I simply want to brand it as my own (and I’m willing to pay.)
If it’s not possible, that’s perfectly O.K.
There has been talk about the team offering a white label version in the past but I don’t think it is available yet. It would be perfectly possible to remove all mention of the modx name by editing the relevant files, but at this point until the official white label version I’m not sure on the legal side of it, and I would say it most definitely wouldn’t be ethical.
As you say if someone is willing to pay for it, it would be a great income stream for the team probably not mega bucks as I think most users would still use the free labelled version, I know I would, and maybe the amount of time and effort they would need to make it easy without editing files is not worth the income they would get.
Only the core team can answer some of those Q’s.