Like Tom says it really doesn't surprise me that there are lots of people around who are looking for a different experience from their leisure time. What's more even in this day and age they are more than willing to pay for it, especially if it has a little twist to it. I think the magazine thing is a pretty great idea, since it's all of the friends of the client, i.e. other potential clients, who are going to get to see it. What a brilliant advertising ploy. Actually $1500 for a weekends activity seems reasonably decent, I'm guessing the "instructors" are pretty good at ensuring the clients have a good time, and good staff don't come cheap. I see they have seven places left at the moment, and I would guess that the party size won't be that much larger.
In a slightly different field I know a guy who has a business organising traditional English game shooting trips. You know the sort of thing you see on shows like Downton Abbey or 30's Agatha Christie novels, but with arrival at the house by luxury helicopter and all mod cons. A weekend's shoot at a top estate, and that is only two days shooting, runs the client upwards of $250,000. Almost all the clients are from the Dallas Ft Worth area and none of them are mere millionaires. These guys know what they want, and are quite willing to pay for it to happen without a hitch. Almost all are repeat customers, and he has a waiting list for most of the bookings he has available. It's the sort of event where there will be five or six paying American guests, plus the same again in invited guests (well probably still paying, but just not so much as the Americans) from the upper reaches of British "Society" to mingle with. To give an idea a normal days shooting on an estate in the UK will run from about £2000 to £10000 depending on where, and when, you chose to go. That just get you on the list of shooters, you still then have all the other associated costs.