Probably, but I hope you're not expecting anything to really come of this. The amount of space on the HDD you save will likely be minimal at best, and there will be no performance improvements... At all. The only reason to do this would be to feed your OCD (obsessive-compulsive disorder) tendencies.
OS 10.6.8, at root level looking into imac/library/Receipts, is there any housekeeping that can be down to clean up years of many updates.

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