You might be surprised. Consider that every doctor's office (at least those with 2 or more doctors) is almost guaranteed to have someone they call for computer help, and odds are high that you've never heard of any of the companies. Those companies may consist of only 2-5 people, but just with changes over the past couple of years along with changes coming in 2015 (ICD-10, end of support for Windows Server 2003, lingering XP users) there's a ton going on just in that one vertical market.