50 stamina points to a high level player is useless, I mean seriously, guys that there should be a reward after level 1850 when the XP doubles, at least 200 stamina points minimum when you level after 1850, we can't even hit out bosses with 50 stamina points
My suggestion would be 20-25% of max stamina per level-up at the higher levels. Personally I think that seems reasonable
http://forums.kanoapps.com/showthread.php?6897-Refills-gained-from-leveling. There is already a thread started on this issue probably more then one but this is the most recent one i could find. Please put your comments and vote on this one if you would like to see a change to that. More votes it gets the better chances it has to be looked into by kano and possibly changed.