for me, having experienced the inability to convince the "concierge" that I have no intentions of buying, and would prefer to NOT attend a presentation....if they are going to go thru so much effort to continually ignore my refusals and badger me into attending....I have no problem whatsoever with someone sitting thru just for the free gift.
Part of the model is that they already "conned" you into spending thousands, so it should be pretty easy to get you to dump a few more thousand into the program.
They don't consider resale owners in their model.
Personally, I view it as a contractual agreement, they offer me XXX to attend a sales presentation in which I have no obligation to buy anything (I make sure this is clear). If I tell them I am not interested in buying anything, and they still offer me a gift for attending, then it is on them for inviting me (assuming I agree to the terms).
Set an alarm on the phone, tell whoever it is I am going to sit with that I told the guy at the front desk that I had no intention to buy anything but he offered me XXX if I came to see you and stayed for XX time, I have set the stop watch and am here.
The expectation has been set, and it is up to the sales person if they want to go through their spiel or not, once the alarm beeps, I am done.