First lesson: Never sell via auction unless you don't care what price you sell for. As it stands, you have now sponsored someone's Grand Hotel because assuming you can indeed ship that big box for $14, your total sale price for EBay and Paypal's purposes is $91, and they will take 13% between the two of them - $12. If you didn't have any shipping costs (i.e. you have a box ready) and don't factor in the time it took to hunt this deal and gas etc, you are making $65 (so your loss is the tax you paid on the purchase - assuming 7% (but could be higher) this is ~$5 lost.
Then again, the best lesson is a painful lesson. I think you would have easily sold if you put it up as a 10 or 30 day BIN for $99 plus shipping, or even higher (but including shipping). That doesn't make you a ton of money either, but you should be able to get ~$10-$15 out of it. Alternatively you can list as auction, but set your beginning bid at a level where you at least make a profit.
All this is of course assuming your only strategy is a Quick Flip, which will be hard on the Grand Hotel as it is readily available at retail (and sometimes at a discount). As this is a pretty neat set (a Trump style hotel with all the gold ) it will likely go up slightly in value post retirement, or, around the Christmas holidays if stock runs out. Those are the right moments to sell this set - not now when they can be bought at retail or less. You might want to consider putting them in a closet and forgetting about them for 6 months or longer, then check back. Or see if you can sell them for $100 on Craigslist -> no fees, or put them up here on Brick Classifieds (also no fees).