REAL Gold nuggets are like diamonds, the bigger they are the more rare they are. Now granted, these prices can fluctuate, depending upon the aesthetic appeal of the nugget. Some are very pretty, others are as ugly as a baby vulture. And let's not forget, everyone has different tastes. Some folks like the smooth river worn looking nuggets, others like nuggets that are more rough and jagged, still other folks like nuggets with quartz or ironstone in them.
Some folks just like to collect different types of nuggets.
No matter what you pay, as long as you like the nugget, and you feel good about the price, and the seller has given you enough honest information for you to make an informed decision, then you have invested in a rare piece of what God and Mother Nature have created. Sometimes people are willing to pay a little more for a particular shape or type of nugget because that's precisely what they have been looking for. I don't have a problem with anyone paying whatever they feel comfortable paying for a nugget, no matter the price. The problem I have is when the person buying the nugget has an expectation that they are getting something much different than that which arrives in the mail after the sale is complete. When nuggets are advertised without a weight or measurements, or standard of reference for size you have nothing to go on but to guess from the picture.