It's happened to us all at least once (or twice... or a hundred times sweatdrop) *petpet*.
Last month I lost 30mil to a RIG... I pretty much decided since then that if I don't have money to purchase them from the shop, I might as well not bother playing.
I suppose if a person has a ton of gold laying around though it's not so bad (not assuming you do, but some people do).