Because of the convenience. Why should I have to go and spend my time prompting an AI, if someone else has already done that for me. Same thing with food. I know how to cook a chicken risotto, but sometimes I like having someone else do it for me.
Personally, in almost all cases I think it'd be more convenient to just prompt AI myself (and maybe get the original prompt) instead of having to sift through overly-verbose AI output from an unknown prompt.
