Interesting you say that. I have an iKon that I also can't get the hang of. Not sure if I'd ever sell it but there are other modern razors that are tempting me.It is more likely that you shave with an angle that was too steep.
Shaving with the Tradere or the Pils or any of the iKon razors that had a similar design takes some people a bit of getting used to. They aren't 'plug and play' because the design is substantially different from most razors you have used in the past.
Keep trying it. Over time it should click. If it doesn't, or if you decide the razor just isn't for you, I don't think you would have much trouble selling it.