I don't have a site so I have never done that, but I have seen alot of sites that have this donation option though not every one tends to click on it, your content has to be impressive enough to convince them for the donation.
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But what about the fact that people might think that it is a scheme developed to rob them if their money, things like this should be considered.Since it is your own personal website then I think you can add the donate button to it, donation has been one of the ways websites make money.