500k (+100k for the port) per timer, per port, per day.. is way too much
After 5300 hours of playing the game I don't really want to PvE just to deny being work-flipped / night-flipped / you-name-it-flipped.
So two possible approaches
Lower timer cost
Enable the option to pay for port timers with pvp marks, maybe 5-10 pvp marks per port per day.
The second option would also "cut" the amount of PvP marks on the server and thus cut its inflation, making them more valuable again, making pvp more rewarding.