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There is no need to use sarcasm, you can just inform the person you are replying to without trying to belittle them

The parent's tone doesn't come across as belittling to me - it seems more like a playful, joking form of sarcasm - although I guess tone is difficult to decipher on the web. Nevertheless, there's no harm in a little humour, and I prefer to give parent the benefit of the doubt.

The Humble Book Bundle has only appeared fairly rarely (maybe that's changed now?), and tends to stick to "geeky" books, unfortunately.

Thanks, I've bought things from several Humble Bundles but I'd never heard of this one.