Another thing, even if he tells you he wants to play college ball or football or whatever his excuse and isn't interested in signing, if you really like him you can offer him again and he might come back and decide to sign w/ you.
I had a draft pick about 4 seasons ago who's initial demands were for like 2.5 mil, but he was contemplating a professional basketball offer, despite being a slow 5-9ish type first baseman. Anyhoo, after a week or so, he came back and told me he was going to play professional basketball, so thanks but no thanks (no secondary demands, he just wasn't going to sign). So I decided what the heck, and offerred him 4.5 mil to see what he would say. After thinking about it for another week or something, he came back and told me that he would sign, but his initial demands had gone up, to 3.5 mil. So the 4.5 mil was rejected, w/ the new demands of 3.5 that I offerred and he signed w/ my club.