This issue is really starting to bug me. The current system just means that sellers list items for pennies, but add a stupidly high postage, just to get the top listing. I want to be able to search on the price and postage combined. The cheapest item with postage should be the top listing, not someone with $15 minimum postal charge.
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I would propose that this column simply isn't sortable if the user isn't logged in and make that a sortable column if the user IS logged in.
Shipping probably isn't included in the historical average price. The store(s) using this pricing strategy may not see an issue with it because they're making up the loss in shipping, but it would pull the part's average selling price down. That would affect anyone using that measure as a guide for their own store. I don't pay close attention to individual stores' pricing, but I do reference that average selling price quite often.