The cap is so quick and easy in this game. lmao
Only reason to use an exp elixir would be if you're trying to be the first 36 of the season. Other than that, it's way too quick. Getting Abbadon just for his exp boost is a large waste of platinum.

Only reason I can see an xp weekend to be of any desire to anyone is if they have a lot of pets they went lvl'd on all of their characters.