You make is sound like we review nothing but high dollar items. This is far from the truth. Most of the reviews we do are well within the range of most people's budget. I was on a serious budget when I bought my first system and used reviews from here to make my decisions.
Purchasing and returning equipment is just not an option for a lot of reasons. Ethics (as Clint stated) is one of them. Second, the things we do to equipment (especially electronics) like taking them apart, testing amps, etc., would void most return policies (much less warranties). This means that at least occasionally, we'd get stuck with the cost of the item. Somebody, somewhere, is sure to catch on that we buy electronics and return them. And they are going to refuse to take back an item. This means we'd end up getting paranoid and only getting extremely cheap items "just in case." Then we'd have all the forum members complaining that we only review crappy stuff.
Not to mention, once a manufacturer learns that we'll buy a product (they won't know that we are returning them), why should they ever send us another one to review? All they have to do is have a couple of their employees register, ask for the review, generate enough "buzz", and we'll go out and get it ourselves. Easy, painless, and most of all free. They don't have to pay for shipping or anything.
Also, we get enough flack about being biased without trying to woo manufacturers with good reviews. So:
And if a manufacturer sees positive things being written about their products here, there's a better than zero chance that you might build a relationship with them based on it. Possibly leading to further products being sent your way, but of course next time for free.
just isn't going to fly. We're here to build a relationship with. We don't require that you advertise with us (anyone ever see a Pioneer ad on this site? And how many reviews have we done of their products?), we don't ask to keep the equipment, all we want is for them to ship it to us and ship it back. That's really not all that much. If that measly cost is too much for the manufacturer, then I don't think they deserve the coverage we'd give them.
Personally, while I understand the suggestion, I think it is a shady practice and I wouldn't do it if they asked me. Remember, each of those return items will probably be put on some sort of discount rack. Probably to be sold for under MSRP (because it is a return). In essence, you're asking the store to pay for the review. That doesn't really seem fair does it?