I'm not getting the concerns for who has more or less stam. If you have a very small amount of stam, you're obviously not spend your dots on it and if I pay and get mine refilled which is about 22K+, but someone like Boatsnos pays and gets his 100K+ - more power to him - he's already made the investments in his stam and I'm not going to quibble.
This might get those who don't have time to regen stam, to buy a recharge....should be VERY expensive though, pro-rated incrementally for the recharge. As for those who have already bought their upgrade...they should pay more for this recharge as there is a fundamental mechanism for stam recharge...it's referred to as time. I do not believe a player with 100k should pay the same amount as a player with 20k.
FS has survived so many years due to....patience.
DP