Negative Camber

I have been using a pretty good local mechanic for my Porsches over the past several years. On the 993, I recently had him replace the original shocks with the Bilstein set up and it improved the overall feel of the car dramatically. However, for other reasons, I have switched mechanics to a different P-car specialist. (I generally stay away from the dealers for maintenance of these cars).
The new mechanic pointed out that my relatively fresh set of tires now needs to be replaced all around because the camber was set up very aggressively to the negative. While this may be fine for racing, I never track this car, it is a daily driver that I also use for the occasional nice weather jaunt (since it is a cabrio).
My question to those in the know: is it wrong for the original mechanic to have set up the suspension this way given that the car is not raced? It seems to me that I would not be replacing my tires this soon, but for the negative camber set up.
Thoughts?

 

Thanks, Neil. That was helpful.

 

Yep, car was lowered; tires, while not brand new, are relatively fresh~ under 8k miles; the bilstein set-up was done in July of this year, all work by the same mechanic. Yes, camber is adjustable, question is whether it is reasonable for the car to be set up this aggressively for street driving. (I am not trying to get the last mile out of the tires, but this seems to be premature wear, and it seems like the mechanic should have known better).

 

Fair question. This guy has lived through my GT2, a Lambo (which he didn't work on) and knew that the P car was not meant to be anything other than a daily driver during nice weather, and for the occasional Sunday drive w/ the wife. He is quite aware that I am not looking for 10/10th performance from this car on the street, and had no intention of tracking the car. I lowered the car because the US spring height looked awful; I went with the Bilstein system because, he informed me, that it was actually cheaper than replacing with factory shocks. The car seemed rattly and I knew the original shocks were, ..shot.