I am also skeptical of lists and reviews. It's good for the list-maker as it is another source of revenue, but if you have paid to be included in a list you won't stand for a selection of bad reviews so by default, lists are biased.
Sorry, but that doesn't describe anything that we do at all. Every listing is completely and totally free. And if any facility expects special treatment regarding reviews because of some type of payment, they're going to be very disappointed. In fact, something similar happened only once. A marina told us that if we didn't remove a negative review from a real boater who wrote it, they wouldn't renew any sponsorship in the future. I cut them a check that afternoon for the remainder of the year and turned off their sponsorship. I wish I could say which marina it was - and the interesting thing is that they later asked to be a part of the sponsor program again (we turned them down).
The magic actually works like this...
A facility has great reviews because they provide great service. They start to realize that more and more of their business happens because of their reviews and exposure. So they want to find a way to first, make sure the review site stays around, and second, want additional exposure for their high ratings. It becomes something they're willing to pay for.
This is significantly different from the previous, common advertising model where whoever was willing to pay, got the exposure. It is much better for the boater when the exposure is based on quality of service rather than a marketing budget able to pay.