>They do have such a thing, called PremiumPoints, for their two highest tiers (Premium & Platinum) of five (Shattered, F2P, and Standard being the others).
Hmm. Premium Points are pretty different from what I posted. They do reward you for having a premium account, but you get the same amount of points every month. If you close your account, or convert to standard, you just lose the months you aren't subscribing. You get 100 the month after you start premium back up again. The best PP analogy I can think of is starting out at 50 PPs for the first month you subscribe, then 60 per month after 2 months, then 70 per month after 4 months, up to 100 after about a year. Maybe with a bonus for a consecutive-1-year subscription, and a further bonus for consecutive-3-years, or whatever. Honestly, I wouldn't recommend this for Premium Points, since they already require a fairly substantial subscriber cost. Something like the SimuCoin Rewards affect all subscribers, and having a sort of "tier-up bonus" for consecutive months as a paid subscriber seems fairer, along with maybe an annual or biennial/triennial reward.