Affiliates to Help Creators

Problem : I wanted to donate money to Pewdiepie. The problem was that I was a broke college student. So, how can I support him so that he gets money but I don't pay him?

Solution: Before buying a product from amazon (let's say a shaving kit), I'll put the link of that product in my site. It'll then generate a link affiliated to pewdiepie so I can buy the shaving kit at the same cost and simultaneously he gets some money.

Please tell me if this is a valid idea and are there any loophole in this?