This is not a bug. The sP requirements for Sarah are waived for new accounts. :)

From our FAQs: There are two other normal quest NPCs that work the same as above but have sP requirements. Sarah's quests are meant for beginners. Accounts less than 2 months old can access her with no sP limit. If your account is older, you must have less than 1,500,000 sP to do her quests. This includes in your shop till. Saggitarius on the other hand, requires that you at least have 1,500,000 sP on you to do his quests. If you go above Sarah's amount or fall below Saggitarius's amount, you will not be allowed to finish any quest you started.

Since this is not a bug I am going to lock this up!