Via Glenn Reynolds, I'm reminded of the egregious charges hotels and conference centers charge for group net access:
There were 11 of us in a small conference room with a table that seated 12. Naturally, we all wanted access to the net, but the charge for that was $175 per person! That's $1,925 for internet access for the group. We (I) pitched a fit, and they agreed to cut it significantly, but it was still far more than what we were willing to pay.
This leads to absurd situations - at last year's LinuxWorld/NetworkWorld (note the second name) there was no internet access (the conference center wanted $300 per person). The question you have to ask yourself is - does that kind of charge plan actually work? Given all the business they don't get, does the business from the occasional moron who pays for it make up for it?
Publicity isn't that useful for this, since the people affected are transient, and may not return to the same hotel/center anytime soon.