If they are like many VFD the chance to get some full time guys to take the burden of the daily chores and common calls out of the hands of a shrinking volunteer pool is hard to resist.
Many of the Departments in my immediate are are combination paid, vol, or paid per call. The decision to hire comes out of necessity. Last year 12% of our calls not one single volunteer responded to. The two career guys handled on their own or with help from other departments. The Chief also responds any time day or night even for regular EMS calls.
I hear total volunteer department in the area have calls and some times they never respond at all. If you have a Volunteer FD in your community your taxes are cheaper but you have no guarantee of immediate service.
Keep your guns stashed and your powder dry.