On a particular non-sponsored product-review blog there are requests for donations, but responses are poor.
Currently, there is a simple site-wide donation button like you might find at Wikipedia. It occurred to me that if each individual post had a donation goal to fund the products purchased for the post's review readers may be more inclined to donate.
To give some background, the blog does have some regular readers but the majority of visitors to product-review posts are linked from other sites, or stumble upon them from web searches. So they're less likely to want to support the writer, but likely to desire more posts such as the one he or she landed on be written.
Does anyone know of usage of such a system or the efficacy of it? I don't believe it would be difficult for me to implement, though it would be cumbersome to update old posts with cost estimates.