Thought of and easily abused on purpose. Think about it.
@OP: Also, "Pay once to play unlimited" isn't going to keep the server alive unless they keep the KP Shop in. Pay2Play monthly requires loyal customers that you're guaranteed will stay and the profits must equal to or surpass what they're currently making with the Free2Play heavy cash shop model. Pay2Play also means the cash shop must be toned down to make the money's worth for the player in order to not burn them out for that steady stream of profit for the company. Can you maintain that subscription? That's a hefty gamble.
Yes, pay wall slows down botters(Yes, they can get around these pay walls. I'm sure you're not a fool to think botters and scammers can be stopped by a pay wall, because there were botters even during the time we had subscription model servers in Pre-Renewal iRO.) and scammers. Then again, it also stops a lot of other players from staying or playing the game. Take for example, FF14 has plenty of players, but it also stops a lot of other interested potential players from joining due to the Pay2Play model out of hesitation and time investment. What worth is there in playing a Pay2Play subscription model game if you pay for the entire month and end up only playing for 1 week combined out of that entire month? Try to think on those terms. Not everyone has the time in the world to make the most out of subscription model games. This is also the case for a lot of players who only log on to WoE and such. Business-wise, it isn't healthy to cater to these time constraint needs via the "Time will only be spent with the time you play." They will lose money if they went by that kind of suggestion.
That^ also means trial periods must be given out if they want to attract new customers. Scammers can still use fake IDs to create new trial accounts to scam others if needed. Spammers only need those trials to keep on spamming.
And what about the multi-client oriented players? That opens up a whole can of worms.
^
Nuff said
Edited by HeIIraiser, 22 November 2013 - 10:26 PM.