I figured it was that. The pricing looks like some sort of average. A few things to consider, The prices you see on Ebay may include shipping as many items are listed as "Free Shipping" and the cost is built into each inflating the price to more than what it would sell for.
The second thing to consider would be condition, your carts do not seem to be in very good condition, in fact many look dirty and in poor condition.
Lastly, you are selling in a marketplace without any fees, to collectors. You should include any selling references you may have on other websites.
If you really want to sell them, have clear pictures of the items including both labels. Use a good camera with proper lighting and take some pictures. Maybe browse through some other listings here in the Marketplace, you will find many examples to use as a guide