Well, one potential issue I can see being a consideration is that as MR grows and attracts more members as e-readers become increasingly popular, some of the newer ones might end up seeing the Deals forum as a way to $$$MAKE MONEY FAST$$$.
Then they might end up posting individual threads for each and every one of their bargain "finds" which happen to be under $5 (instead of the tidy and considerate grouped-per-publisher time-limited discounts/well-known author on special promotion threads that people currently post), thus leading to a lot of clutter as they try to put their affiliate link out.
And doing the math, it doesn't really take all that many links to add up to a decent sum. Today's new FT Press Kindle freebies all have page views of at least 80 already, and it's only been what, 10 hours since they were posted? Some of the repeats are well into the hundreds.
If even 25 of those hundreds of viewers who click through on the freebie then go to buy a single 99 cent indie book within the next 24 hours, at 4% commission that's roughly a dollar a day, which will pay for three shiny new Kindles With Special Offers over the course of a year.
Admittedly, it would be a lot of work to track down and post free books that hadn't already been posted before in order to earn this amount, which by that point would have been well-deserved.
But my cynical side says that any potential link-spammers probably wouldn't even bother providing us with freebies and would likely just crib a bunch of books from the "Sort By Lowest Price First" search on Amazon in the hopes that enough of us will will want to buy those $1.99 With Bonus Material HarperCollins titles and end up posting individual threads for every single one of them.