@Xenoargh
Yes, I agree with everything you say and didn't have the time to post myself. Though I think I would have Alex's Software Engineering rates at a higher rate than that. The support subscription fee is for bugs Alex's own code. Consultation and training would be separate.
But anyway it could be an opportunity, or not, I think if the OP were serious and knew what he were doing he'd be having these discussions via private via e-mail, phone and face to face conversations. I find it ...confusing that he'd post it on the forum in the first place and makes me wonder how much experience he's had with these business dealings..