QUOTE(Kinights @ Jun 24 2017, 07:55)

why does it cost Stamina just to start a Grindfest and Item World?
The reason seems to be not to exploit full regeneration when leaving battle, but other than using the system for grinding proficiencies, I don't think anyone would use it in their normal playing schedule, as the starting rounds of GFs and IWs have less monsters per turn, so a lower overall income in the end.
I don't believe this is how it works, but I could be mistaken.
The way I read it:
GF:
Old system: stamina cost is paid at the start of each round:
New system: stamina cost for first 50 rounds of GF is paid at the start of round 1, then paid per round from round 51 onwards
All this means is if you start a GF and do less than 50 rounds, you gen penalised.
For IW:
Old system: stamina cost is paid and the start of each round
New system: stamina for entire IW run is paid at the start of round 1
This is important, because otherwise peeps could play until nearly dead, then leave IW and still get PXP, the re-enter straight away with full health and no stamina punishment.
This is also a bonus for casual players like me. I very rarely go under 97 stamina, so this means I CAN use the IW jump in jump out tactic to heal up, because I have shit tons of stamina that I never otherwise use.