yah def. do not go to him.
You can buy small sensors that tell you what your camber is set at.
Helsp with people that do it own on alignments.
I wil be probably buying me a set here soon.
I doubt that your rear end is so bad the machine couldn't see it.
Camber is only adjustable if you have a camber kit (bolts) or aftermarket struts that allow for adjustments (slotted).
I also doubt your toe (the only setting adjustable from the factory) was so far out or in that the machine couldn't see it. (if so you would feel terrible pull to one side or another and you would see it on your tires A LOTTTT)
Camber won't wear tires down that much if at all.
It improves your contact patch in turns.
It can scuff the tires to an angle, but it takes a long time for that to happen by any means.
And i know your caster isn't out of whack because that's not adjustable at all on our cars.
I just recently got my konis and mopars aligned the other day after going to 4 different shops.
It cost me 199.99 to get it done.
I first had sears do it and they FUCKED my settings up and stripped my right front camber bolts so i got that for free.
Went to a couple more one said they wouldn't do it cause it's to low (stupid considering it's only 1 inch lower than a stock neon

)
Finally got tire barn to get me one on tuesday and give me a free camber bolt with it since sears fucked mine up.
I wanted him to set it at ...
Front - -2 camber 1/16th toe in (.06 toe)
Rear - -1 camber 1/16th toe in (.06 toe)
Here is close as he could get it after and hour or so.
Front Left - -2.1 camber .06 toe in
Front right - -1.8 camber .07 toe in
Back left - -1.1 camber .06 toe in
Back right - -1.2 camber .01 toe
Close enough to what i wanted so i said hell with it ... al ot better then what sears had mine set at

-.5 camber on fronts and .15 toe in and rear at -2.5 camber and .15 toe in.
SCREW THAT and stripped my bolts.
Hell if i'll pay them for making my alignment worse than when i went in there for.