I think online reviewers probably re-sell products, which they review, on eBay, Amazon Marketplace, give them away as gifts or part of a contest, or use the products at their home.
If the products they review are junk/bad, or broken during the review testing time, the products probably get refunded from the store, or thrown out in the trash if the item cost only a few dollars like most stuff from the dollar store, and discount stores like Wal-Mart where it may not be worth the reviewers time to get a refund for something which cost under $3 like a cheap pair of headphones from the dollar store..
If the products they review are junk/bad, or broken during the review testing time, the products probably get refunded from the store, or thrown out in the trash if the item cost only a few dollars like most stuff from the dollar store, and discount stores like Wal-Mart where it may not be worth the reviewers time to get a refund for something which cost under $3 like a cheap pair of headphones from the dollar store..