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I know it's against convention to comment on downvotes, but really? Really? This is controversial? The OP came up with an elegant solution that cleanly solved their problem without subjecting contributors to anything more than a captcha. Then somebody comes along and says "oh, it's so easy, just charge $10". You're going to set up payment infrastructure, incur administrative overhead with human support managing refunds, and deter 99% of actual humans from contributing, and then call that the easy solution that OP is so stupid for not thinking of first? Give me a fucking break. This site really is just Reddit-lite, anyone who thinks about engineering problems seriously would realise this does not stand up as anything beyond a pithy internet solution with three seconds of thought into what actually implementing it would entail.