When accepting JET Terms you agreed that JET has a total control of what price is displayed on JET marketplace for your products. You can only specify a price which you want to sell a product for, plus you can use a map price and msrp to restrict JET from manipulating prices too much. But other than that, this is up to JET catalog team and JET algorithm what price is shown on the marketplace. Please note that no matter what price a customer buys your product for, you will always receive an amount you specified as a product price.
Please also see: How can I use Price, MAP and MSRP to control my pricing?