I checked several of your listings, and they all showed shipping via USPS. As noted in the other post, USPS doesn't have a surcharge to HI, AK etc. (as private carriers do) so shipping to those locations via USPS will cost the same from your Utah location as shipping to me here in Boston or indeed to any customer on the east coast.
I also noticed that your listings offered Parcel Select. But it costs about the same as shipping via Priority Mail so the slowness of ground shipping is not a great reason to rule out customers in those locations, either. For instance, shipping a 15-pound package to Hawaii or New York costs $46.71 via Parcel Select Ground vs $47.06 via Priority Mail.
In other words, you can use your Site preferences to block bids/buys from those locations, but there isn't a financial reason to do so.
You can compare prices of Parcel Select and Priority here:
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