Toe is usually a bigger contributor to inside-edge tire wear than negative camber is. Toe-out is a problem, especially when combined with any negative camber. If you have a reasonably-sane amount of negative camber (up to a couple or three degrees) and no toe out, tire wear on the edges should be small enough not to really worry about.
You'll probably want to get an alignment after installing springs anyway, but I wouldn't be surprised if they found toe-out on the wheels that are causing problems. Also look for worn bushings and slop that could cause the wheels to go into toe-out while you're driving.
-soD
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