No it's not. What you suggest is, essentially, penalising anyone who has a successful marketing strategy, which is exactly what this is. What if (for example) I, or Monte, or anyone else, comes up with something fantastic - a great marketing strategy, and their products sell abnormally well. Are you going to punish them for that?
Also - those complaining about the effects of the sale should bear in mind that the sale is benefiting them indirecty. The more customers RPGNow has, the better it is for the publishers who use it.
If people are worried that the can't compete (to paraphrase someone else), then they need to review their marketing strategies and their products. They're either not selling what people want to buy, or they're not marketing it properly. Putting sanctions on those who use such tools successfully (either by luck, good sense or whatever else) is grossly unfair.
I gotta say that, while this sale, its aims and its strategy has nothing to do with RPGNow's top lists (that's just a nice little side-effect), on principle I think I'd be pretty upset if one of the goal posts were moved just because someone was doing well. Nothing to stop those complaining doing exactly the same thing.