Generic minor gripe to follow:
We are capitalists living in a capitalist society engaging in a capitalist-enabled hobby. Consequently, we get it that nothing is free. Just state that shipping is included, not that shipping is free.
On that note, when you charge shipping, do you consider it shipping and handling, by which I mean, charge for packaging materials? Like many people here, I reuse quite a bit of packing material, but the 100 cardboard mailers, rolls of tape, and occasional boxes do incur an expense. Myself, I don't figure them into the cost of the comics. I price my comics and then determine shipping. So it cost me $3.65 to ship one comic in a cardboard mailer to a nearby Souttheastern state, but I charged $5.00 as the mailer cost ~$1.25 and then whatever trivial cost for tape, printer paper, ink, etc.
Is that overcooked in your opinion, or is it reasonable? Obviously, I'm in the latter camp as those are expenses incurred, and like any good capitalist, I understand that expenses are passed to buyers. I just do my best to make sure that I'm charging for a legitimate expense, and not overcharging for it. Getting burned on shipping and handling is something that really ticks me off, so I try to be fair.