There is no doubt that collecting paranormal objects can become expensive. Depending on what you collect and the strength of the energy of the object collecting can cost anywhere from a few dollars to hundreds of thousands of dollars. So why the expense?
First the cost is determined by how the seller came into the piece... was it inherited and therefore cost nothing out of pocket or what it enchanted for the seller?
Enchantors always charge for their services and depending on whether it is a single spell (usually $25 fee) or multiple spells ($50 and upwards) depends on how much it will cost for you to obtain the object.
Ebay has opened a portal for multiple collectors and sellers to offer their objects to the general public and therefore the cost of collecting has hit a haywire chord. It no longer becomes an issue of how much an object is worth but rather the popularity of an item dictates what a seller will be compensated.
However, before ebay existed collectors found trade and sale through communities, organizations, Orders, Alliances, covens, and friendships to be the only way to obtain treasures of enchantment and therefore the availability and cost of casting dictated the worth of an object. There are still objects you will never see on ebay's auction offerings as to offer something supremely powerful to the general public is all but too foolish... so they are only offered to trusted collectors.
So what do castings cost? Anywhere from a few dollars to tens of thousands.
What effects the price? The price is drawn from the difficulty and master skills required to enchant the object with the entity you select. There are some entities that can cost up to $100,000 for one piece... it all depends on what you want casted to an object.
You should keep this mind when you wonder why a seller is charging so much for a particular piece. We have our pieces sent in from states around the USA, and abroad... France, Spain, Italy, Germany, China, Japan, Australia and Canada. Cast by friends in covens, Orders, Alliances, communities and witches of favorable skill.
Enchanting an object is not an easy task, it requires the knowledge and skill of those who make their lives with their trade. Bear all of this in mind when you are considering the price of a treasure you want to buy.