What a great position to be in! Mind you, a six year wait is patience indeed!
If the bank balance looks healthy, I'd go for it. Both the knife and the sheath are great pieces of kit. I still regret selling mine for not enough a few years ago but, like many here, I have 'moved on'. They are great to use and it will become a firm favourite, I'm sure.
I firmly believe that the Woodlore is designed and made to be used. I would strongly recommend that you do exactly that rather than hang on to it as some sort of object of fascination. Selling it and reaping an enormous return is, I suppose, another option but, to my mind, flies in the face of the spirit of bushcraft - but that's another discussion entirely. As an investment, it'll probably outperform any stocks, shares, ISAs, bonds or equities in its own modest way; but is that why you bought it?
Whatever choice you make - enjoy it!