Autoblogs are less popular than review sites. A visitor reading a review has greater chances of clicking through to Amazon and buying a product. An autoblog usually looks automated and visitors click out of those sites very quickly.
You might as well use the time to properly build a legit site than building an autoblog site which have a high chance of getting demolished by google.
The biggest secret is just to send as much traffic as possible to Amazon's site. They are very good (maybe the best around) at converting visitors to sales, so just get them to the site.