I very politely disagree. I let the tool itself be the main deciding factor. After the friendly Matco driver is long gone, you're stuck with a Matco ratchet when perhaps - you would've liked the Snap-on version better. If the driver is that bad, I just bypass him and find another source.
By all means, that's your right. Of course -- if Snap-on has a clear advantage (and they sometimes do), THAT'S the tool to get. I already have what I feel are the Snap-On essentials that I picked up before I started working there. If there's something that I'd like to get from Snap-on, I'd most likely hit ebay for a used version, waiting for a decent price. My friend/owner of the shop just paid off his Snap-On tab and we both check the other trucks first, which should say something.
The Matco guy has been there for five years. When I started at the garage, and it was clear that I was going to be sticking around, he acknowledged my presence first. It might not mean a lot to some, but I appreciated it. If I'm going to pay $90+ for a new ratchet, especially one that's not common but necessary, I'm going to give the money to someone who I feel is doing a great job and offering a solid product -- and I feel that the Matco 88-tooth 1/4" ratchet was a great purchase (I wouldn't have purchased it otherwise). I like supporting people doing a good job; put effort in. That's why I also get SK. I like what they represent and their price point. Proto is another one. I just got their long 1/2" ratchet for suspension work.
My family has been in cabinetry for forty years. I've seen more salesman in my lifetime than most -- lumber, equipment, hardware, etc. Honestly, I disliked most so when someone good comes along, I value them. There's no right or wrong answer here, as far as I can tell, and if you want to look past the salesman (no matter how bothersome) and strictly at the product, that's a valid approach. At truck prices, I look at the salesman and the product. If they're both not there, I'm sure I can find the tool I want elsewhere and surely cheaper.