Hmmm, well, you ARE hearing it second hand, so I don't want to speculate on that, but as far as pay-to-play goes....
If it's during normal store hours, then I think it's silly. Those lights would be on anyway, and unless you're providing some special service(such as a private room, minis, books, ect...) there's nothing you're really giving these people that they can't get anywhere else. Of course, it's STILL private property, so they do have the right to charge anyone whatever they what for whatever service they want to provide(or not provide). But then, taking the "this is my business, do what I say or get out!" tends to drive off business.
If it's during extended hours, or it's in a separate building that's not normally supported by the store, then yes, I think it's completely within their rights. This should be expected.
Likewise if they're providing special services such as food or drinks, even at discounted prices, bathrooms, ect...
I think it's fair to ask a little of those who ask something of you. You're getting a place to play that presumably you cannot get elsewhere. If you are not willing to compensate the store through extraneous spending, then unfortunately I think it's fair to extract a fee from you.