Why should I hire Manisec to monitor and maintain an IDS system for me?
Because IDS systems require an inordinate amount of skill, talent, and knowledge on the part of the person(s) who adminster the system. It is not the kind of task that most IT professionals (even top level system adminstrators) are capable of handling properly, unless they have both the skills, and the mentality to analyze the potential effects of malicious network traffic.