As many as you want for the time being.
is the scripter planning on changing it?
Why don't you ask him yourself?
To answer your question, yes. I am planning to limit the number of accounts that can be run with 1 purchase, after countless requests from my users to do so. The reason for this is overcrowding at the dragon spots, and the prices of dbones and dhides dropping. This limitation will only come into place once the admins have implemented a way to do this in the client. This is probably at least a month away, so for the time being, I wouldn't concern yourself about this.
why not ;) and cheers for your answer