Sorry to break it to you guys, but it's more prevalent than you think. As a rentor and now as an owner, I can see it from both sides.
The rentor wants the lowest rate. $8 a point for a two bedroom villa the week after Thanksgiving comes out to around 30% off rack rate. Not bad but not the greatest discount I've seen. Remember that the rentor is assuming some risk, whether real or perceived. They want some kind of return for that risk. Most, if not all, of these rentals are non-refundable.
The owners may be reducing their rate because they don't want to hang around the rent/trade board for several weeks or months holding out for $10 or $11 a point. They drop their rate to $8 and they're done in a day. They weigh their time against the extra one or two dollars they'll receive. Some don't think it's worth it. They may just want to cover their cost which could easily be below $6. Quick nickels beats slow dimes.
It all comes down to supply and demand. If you think your points are worth $11 or $12, then hold out for as long as you can. Rentors don't really have any other place to go but here. But remember, with 80,000+ members, you may be holding out for a long time.
Edited to add: I was off on my discount calculation. Sorry.