There are a few reasons why. It’s a form of showing appreciation. The reasons for going outside VH is that it is not VH you want to give appreciation/gifts, and the general trust in VH is for common reasons low.
My subs are my way of rewarding the tenants.
And that way your giving more to Henry than most of the rest of the participants. I’m sure he appreciats it. The thought of it makes me smile at least 
Back to the original question. Is it against the rules?
I doubt anyone but VHTV could tell you that, the tenants trying for it would be ignoring it if it was.
Yes it is against the rules as it will reveal their location.
I would report it as privacy v_______n when I get to know about it.
It would reveal their location in the some way a timezone reveal location.
Nope it will at least show the city. So it is not allowed.
It was actually worse. It will show name and city, only hide adress. Crap.
Bottom line is this idea sucks big time.
Yes, Buying gifts for the girls or guys, I like that idea, so we can show them how much we like them, this is a great pickup for a girl that is down.