OP - I wonder if the shop tried to set the alignment but couldn't separate the inner and outer tie-rods due to corrosion - thereby making it impossible to set toe-in. Then, unaware that the rack boots could be removed and the tie-rods replaced separately from the rack, suggested the replacement? This would indicate a complete lack of knowledge of the car, but not malicious intent.
In any event, you need to figure out why they felt the rack is bad. Then assess whether or not their reasoning is sound in regards to replacement. If it was simply that they couldn't set the toe, then replace the tie-rods. If it was something more serious, you may want to get another opinion (or at least another estimate).
Last edited by lmr2wil; 12-30-2012 at 08:01 PM.