its mostly late game method for when you don't really want to mess around and just want to get a deepone branch ready it more or less assumes you're filthy rich
I guess so, yeah, I guess so, hmm... but i think run all the way from the arena to Elise house again and again uncomfortably when you can just save in front of Elise bed after night basement investigations and - Sleep -> Load game -> Sleep -> Load game strat - until you find what you need to the next day.