I'm not a JoeBot user, but... does JoeBot have some config file where you can specify that a certain number of bots is added automatically or that the server is filled with bots by default? Just guessing, because with all PODBots I know it's like this - could be the case with JoeBot as well. Theoretically. Maybe it's worth a shot - and if it's only to waste your time until some JoeBot crack comes by and gives more useful advice.
Good luck anyway!
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Oops, where are my manners - just saw it's your first post here and you're listed as newest member... in that case: Welcome to the BU forum! (Konbanwa Alucard-sama) 9_9