Should i stil buy this tyrant cape?

Saying he wants items instead of money sounds a little fishy. To me it sounds like he's just trying to super lowball your items so that he can get more out of you and make a massive profit.

That's my main concern. Well I think I'm going to have to pass on his cape, Not a big deal eventually tyrant gear will come back from another source (hopefully HMMagnus) and I'll get it then. It's not like I'm in a rush to get gear anyways it's going to be for a Xenon after all