AIBU to write a charity recipe book instead of giving away my recipes for free?

[Babcia]

I've been having this idea for a while, but not sure if doing it would be really arrogant or a good idea?
I'm quite often asked by friends and family for my recipes for various dishes which I make. I'm quite happy to give them away but it's quite time consuming to write them out for people. I'm considering getting them all together and giving them away as a "thank you" for donations to my favourite charity (of whatever they could afford to give).
Is this really arrogant of me to think that people would want to do this? I don't know if people would just think "knob" when I tell them about it. I normally hate it when I get facebook requests for people running marathons or doing skydives etc for sponsorship, because I think that people want to do these things anyway, but at least with my recipes they are getting something in return for their donation...?

I don't think it's a bad idea at all, but I wouldn't let on that you got the idea because people were asking you for recipes and I don't think you can realistically say 'no, you can't have the recipe, you must buy my charity book'.

If people want to buy the book and/or like the idea, they'll buy it. If they were just asking for recipes in the ordinary, polite way, they might well not.