What is this weird obsession people have with Delve? Every day I log on, hear somebody say "let's do Delve" or "I need Shark" or something like that. As though having these Delve items is critical to the gaming experience.

Adding Delve key items to the list of things you can buy with Sparks would be foolish. They already have a set of armor and weapons you can buy with sparks. Reforged AF and relic can be bought with sparks indirectly (by buying the Rem's Tale chapters, arguably the hardest part of the reforging process). Accessories can be bought with gil on the auction house.