On weekends like this with a VIP XP bonus, I like to TR and use an Otto's box to take advantage of gaining 200k additional XP from the stone. The downside is that I skip 90% of heroic content I'd normally complete while leveling up without an XP stone. More specifically, that includes the 150 Coin Lords and House K favor for all of the bank/inventory slots. Going through that content just to unlock the favor so I can clear out my TR cache, well, sucks. I have already purchased all available additional bank/inventory slots available.
Adding more bank/inventory space has been brought up ad nauseum by players before, so if it was technically possible I'm sure it would have been introduced into the game. So I'm just looking for a way to fast track unlocking the bank/inventory space. A permanent solution would be ideal (such as permanently unlocking the bank/inventory slots once reaching the max available Coin Lords/House K favor today, similar to unlocking Inquisitive or Feydark Illusionist per character), but I'd pay for the convenience of "Consume this thingy to gain 150 Coin Lords Favor."
TLDR: Take my money in exchange for convenience.