The economy in this game grew up every day so, if someone want to sell with more than 15k/$ is his problem and you have to acomodate with it.

Well since its supply/demand you can just sell it for 10k/usd and if the market has higher demand than what the cheaper sellers have supply for you will be able to sell it at a more expensive rate eventually.
I haven't had a problem selling tc for 10k/usd so I don't know why you would sell for cheaper than that, I'd even suggest making it more expensive like 6-8k/usd. It might take a while longer to sell it, but its not like you are in a hurry to sell it anyways, it will always be a cheaper option than to buy them off nabi.

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