it makes no difference if you pay or it`s free theres was no call for that remark.
Clearly it does make a difference as you specifically cited the fact that you'd given them to him gratis. I doubt very much you would have done so had he bought them off you.
he posted then signs out.
Oh noes! Someone didn't stay online to wait for your response!
How very dare he do other things! Who does he think he is?!
I personally don't know or care if you're planning on offering some kind of PPC upgrade/repair program to owners of said cards. But apparently having the answers to a question of why something didn't work and waxing lyrical about how you can do it and know where it's all gone wrong does come off as pretty poor. So I'm pretty much in agreement with the assessment that alexh made.
If you know, either tell the guy why or keep quiet about it.