I am that kind of person who just rerolls characters alot. I have done 100% World completion 4 or maybe 5 times now, I at least has a bunch of those gifts of exploration in my bank, never made any legendary weapon.
I don’t think you should be able to purchase 100% world completion with gems, but with those gifts of exploration – you should be able to double click them and gain like 10% world completion for each double click or something.
The reason to why I reroll is mostly because I get sick of the race I currently play, but also I get annoyed because I don’t have that little golden star, it’s such a small thing really, but it bothers me not to have it.
Just a thought… : )