How about giving UO subscribers incentives that would lower subscription costs? For example: If you have more than 4 accounts, the 5th account is half price. This way, maybe people will subscribe to more accounts. Or offer family packages, where having 5 active accounts for 1 year would be less. So, people would be willing to run 5 accounts or more with the incentive that it would not cost full price. Also, how about a time incentive? If characters are active for so many hours maybe they could earn a small incentive or time reward.