well if your charging like $20? and something like that is too high, lower it down to something less. but what seems expensive to you, might be cheap to the buyer. i've changed my prices over and over and still get sales. if it makes you feel better. people will buy that card instead, you'll make a buck or so, and they will frame the card. that's why my card is so high. and yes, they do pay that price if you look at it.
i wouldn't worry about it. my smallest starts at $25 profit and goes up from there. if your confident about your work you can charge for it. if you don't think it will sell, then put like $10 in that box.
---Mike Savad