Pay to win was an afterthought - If truly a heavy pvp focused player is only paying 10 dollars a month max there is no issue.
In fact there is no issue for me, regardless now, if that is the -max- I can be charged no matter what happens.
I still suspect there will be many who will not share that view about being charged in the following scenarios:
1) Game Crash.
2) Exploit or abuse of a game mechanic.
3) Downtime (Loss of X)
4) Griefing a new player before they have learned the game.
^ These are the obvious ones, you can then go into the grey areas of ganking, spawn killing, farming off low levels etc.
I will go as far to say that this feature will probably be redesigned. I feel that strongly about the issues it will cause, and if i hadn't of said anything before putting any time in here, i'd have kicked myself.
However again if I am paying a max 10 dollars a month i'm good personally, nothing more to see here. I've dropped 5 times that on online games regularly before.
On the subject of griefing generally, you'll never stop it, no matter how good the system is. I've been around the block long enough to know that. Only now it comes with the added bonus of costing someone money.
-edit
Replying at work (slow day) couple more replies came up as I posted
I am not under the impression that its 1 kill 1 life. It doesn't matter if its 20 for 1 life, that's still money someone is spending. Also there is a lot of difference on the macro scale when one is a fictional concept and the other something I can buy a meal with.