I personally think we should see how reverse sales affect sales first before we do something like this.
Leaf himself said in another thread (link to post) that he might write up an analysis once the feature has been out for a while and see the effect it's had. I would personally suggest everyone waits til then.
I personally see this feature as being... interesting to say the least and a creative way of getting people to talk about your games but if it gets used too often it could potentially have a negative impact.
But hey don't let me spoil your fun, if you wanna do it then go right ahead. 🙂