NickthePaladin here, I love the idea of putting new items in the vendor to make it more usable. The stadolf mythic account is amazing 5 token trade. However I think with the introduction to mythic, it is worth doing these events 5
Times to be able to get these amazing bolster gainers. Though I do not think the legendary mounts should be 5. I think it should be
1 token for the bag and coal mote
3 tokens for legendary mounts
5 tokens for mythic companions
And as you add either other mythic or even legendary companions or other items it follows mostly like this so it is a goal to achieve. So if you added a legendary companion 3 tokens and then if you added a mythic mount 5 tokens.
This is atleast my thought and I hope others feel like this too!!