None. No effect.The fact of changing them from stock (lowers value) is cancelled out by making the conenctions better. (raises value)
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Spring clips suck real bad, so you certainly won't be hurting value. But then it probably won't help much either. The typical "audiophile" mods (caps, resistors, wire, clocks etc) are where you can start throwing buckets of money right out the window -- even (or maybe especially) if performed by a modding company.