Fair points, Gene. From a business standpoint, I'm sure you know what you're doing. However, from a consumer standpoint, I think the business model leaves a few things left to be desired.
If you are reliant on the manufactures for all of your review samples, than it makes one wonder if you are really free to be as critical of a product that you otherwise might have been. After all, if you are overly negative about a product, a company might not want to send you more products to review.
Also, how can you ensure that the products a manufacturer sends you are representative of what they sell? An example that comes to mind is that Starke Sound amp that ASR measured. They had two samples, neither of which performed as spec'd. Your business model cannot capture that. I am very grateful that it was caught and pointed out to the consumer because I was considering purchasing one of those amps after reading about it on your website.
If you reviewed products sent to you by members, you could have more reviews, which could mean more website clicks. And if you were sent products by members that were flawed and not representative from the manufacturers perspective, then maybe they would send you separate samples to review and compare. Even more reviews. Even more clicks.
I don't mean to sound patronizing here. You know your business model better than I do. I'm just saying from my perspective, I can see room for improvement from a consumer perspective.