What would be a fair trade?

So I’ve been trying to save up for a halo (specifically Witching hour) and I’m at around 480-90k and ik the wh halo usually trades for 3-3.3m so I was wondering would the GoT set+ around 500k diamonds be fair. Or if i added more items would I have a better chance(I also have full sl set -skirt). I’ve read a lot of other Reddit posts saying people prefer the full price in diamonds but are there people who would actually trade for items?