For every person that may "game" the 30 day system on a product, there's probably a good number who may have otherwise returned an item promptly after a first exposure if a short return policy was included, but had enough time to give it a second chance, let it grow on them, and ultimately ended up keeping the item after they'd explored it a bit more.
agreed! and, at least in my case, I wont shop at places w/ shorter policies because I panic'ed and kept a few items and regretted it.
I'll go one further - I've seen a lot of places do "road trips" I just signed up for one on a rainsong cf acoustic guitar. I paid $35 and it comes to me for a week w/ new strings and return shipping included. I think that is the most fantastic idea in sales yet!