This might actually be a better way to advertise on the internet. My biggest qualm with advertising is that in almost every case, the product being shoved into your face is not the best product for you needs, it's the product with the better marketing plan, which has little correlation to the actual value of the product.

With endorsements, it's more likely that I'll get advertised products that suit my needs, because I'll get more advertised products that people who are similar to me have endorsed.

It still doesn't remove the marketing budget factor, but it may more strongly correlate the things that are advertised to me with the things that best fit my needs.