Hello:
It's been a while since i post something, I hope you can give me an advise on something:

I've been asked to sell one of my good selling images, the buyer it's a print on demand service agency, they are interested in one of my images and "probably more in the future" but they can not buy direct from stocks agency since they are reselling the images printed in their products, an so their partners (who also will be able to use the images)
They are proposing a unique payment that gives them the right to use and sell the image as many times as they want and with no limitation on time.

Of course it will all depend on the price, but the contract seems a little over the edge for me, i can see no difference with selling them the rights, appart than the fact that i could still sell the image and they don't want exclusivity.

The image it's quite popular but not a top seller.

Would you sell it? and in what range of prices, hundreds? thousands?

Thank you