It's very frustrating when you've been after a specific item, think you've found that item, then it turns out you haven't. Glad you got your purchase price back at least.
I've purchased a number of things from gunbroker over the last couple years. It's completely hit or miss. I've found great deals there on firearms/ammo with free shipping and no credit card fees, and I've also been charged 3% extra and $30 shipping (USPS) for a scope - neither of which were mentioned in the listing. Most sellers don't seem to use gunbroker's check-out feature - frustrating because the check-out feature is pretty handy and fairly well-designed when you are purchasing a firearm.