CCNP is not a cert that demands a certain salary, but also the location of the job also dictates that. The certification will help with gaining certain jobs over others in the field, but it is also coupled together with experience, not just a cert. Anyone can buy the book, study, and pass a test (ok not everyone - there is practicle hands on needed too but you can sim that). The cert is to enhance the knowledge not be a replacement for experience.
