I recently raised my seat a bit after being fitted at AJ's by Alan there, to get better efficiency out of my pedaling. It was today that I realized my hands started to get that numb/tingling feeling going on since I raised the seat, but my knees no longer were sore. I just raised my handle bars up a little tonight to match the seat adjustment and hope to have this cured, but only time will tell.
About being pressured to buy anything while being fitted there, I gotta say that never happened in the least. I think I was offered some coffee tho. Funny thing too was, when I was shopping for a bike and asking all the annoying rookie rider questions to Darrin, he even remarked that he "Hates to sound like a salesman", but he had some very good opinions that need to be shared.
I hope you get your hand numbness eliminated, I will let you know if this helped for me.