While the collectable market has always had people selling items over their common "CV" value. It's not uncommon for everyday items to be sold at 10% - 50% markups on auction sites or even a local shop or market. It's all about supply and demand. Before the holiday season there was a back order on many of the kindle models (from Amazon
) as well. I know this well, because I bought my baby brother one and had to pay a bit more since I was late in getting his gift. The same goes for the new family sized foreman grill with removable plates that normally sell for $50 - 60 bucks at wallyworld I paid about 12% more for because I forgot to get the gift early. It's not really suckers they are looking for, but people like myself that either forgot or were too lazy to shop early before the chain stores did their holiday markups then the "mark downs" that are actually no more marked down than any other time of the year.
Prices will always fluctuate in any market, but the consumer market is roughly abused during the holiday season. Here is one that is close to my heart. Take Harley Davidson for instance. When you walk into a Harley shop to buy accessories or clothing you are paying 150% - 250% above dealer cost. In a normal retail environment markup is maybe 50% - 75% depending on the establishments overhead and location or this is what I know as common from my own businesses and friends as well. Unless it's a "specialty or niche" shop those figures are quite common. That's why if you want Harley gear you can almost always "haggle" those prices down if you have a nack for doing so.
Now the collector market is a whole other bag of worms. The closest "stamp" dealer to me is roughly 250 miles away. He's also the only one for about that much in a radius so he pretty much asks for CV or right about CV on just about anything and people will pay it because that's all there is. I buy most supplies online and almost all my stamps through trade or auction because of that. In our world it truly is worth whatever someone is willing to give you for it.