Well, perhaps you haven't read some of my responses throughout this thread, but I just want to make it clear - we are not "taking them to Disney World." These are great friends of ours that are in a similar financial position as we are - I only say that to point out that we are not "treating" them to a vacation. We have talked for years about taking a vacation together with our kids. If they stay at a different hotel, we would probably have to split up for the day after dinner as our kids are still very young and would be in bed by 9, the latest. By staying in a villa together, the kids can go to bed and we, the adults, can hang out afterwards, drink wine and talk. We don't get many opportunities to do that - while the kids are awake, it's all about them. No "adult conversations" to be had. LOL They said, from the very beginning, "what will we owe you for the place?" I'm not springing this on them or anything. Sheesh. Further, again if you had read my responses, I will likely not be charging them anything after DH and I talked more. Maybe they'll offer to buy us dinner one night and, if they do, we would graciously accept it. But I'm not seeking it at this point.
Just so that you don't think we are super cheap or something, we did "take" our mothers to Disney World, where we treated them to the accommodations, park tickets and meals. They just had to pay for their airfare. That was a completely different scenario, in my mind.