Okay, everybody heard of the 80:20 rule? Well, this rule also applies in the pharmaceutical sales job market. That is, 80% of the available jobs for pharmceutical sales reps are in the hidden market and unadvertised. The advertised job postings that you sometimes see in the newspapers and online represent only 20% of the job market in pharmaceutical sales. So if you are applying only to advertised positions, then you are really missing the boat on opportunities.
See the article Unadvertised Pharmaceutical Sales Jobs for more details.