The only time I was a "full time minister" was when we went to Australia. It was basically a requirement of our visa, and we raised our salary by begging. For the rest of our life we have either lived off of our own part time employment or received a small stipend to assist us.
When we returned from Australia I was offered a full time job as a youth pastor at a suburban church which I turned down. I am also very aware of how to build a "normal" church capable of supporting a full time pastor. I would have no trouble finding a church to hire me as a full time pastor either. And to be honest... sometimes these options seem like something worth pursuing.
But there is a number of reasons why I will not do this:
First, I believe that it is the most incontrovertible separation between the clergy and the laity. It makes two classes, the pros and the amateurs. And I think that hinders the concept of true discipleship for all believers.
Second, I believe the paid full time pastor is taken out of the "real world" and placed in a pseudo religious world, where they spend their time doing religious things, and do not deal with real everyday problems first hand, but second or third hand
Thirdly, I believe that full time ministry creates two problems in regards to power and economics. It is much harder to say hard things to someone when they can effect your ability to feed your family. And once you are relying on this economic reality of a pay check it also makes it easy to play the game, in order to continue in your role.
Fourthly, I believe that the money spent on salaries, as well as buildings, are better spent on caring for people, especially the poor and marginalized in our communities and around the world
Fifthly I believe that planting churches is the way forward, and in order to do that they need to be easy to plant. Taking away the burden of a salary makes things much easier to do.
And lastly, I believe that the role of the professional minister has become so maligned, or glorified, that it must be abandoned in its modern context in order to have integrity in our world.
I know others disagree with me, especially those that are getting paid. I also know that with incredible integrity, these issues can on some level be dealt with. But I believe the best and most perfect way forward is with bi-vocational ministry, even if you feel over burdened at times.
That said some of the best, and most amazing people I have ever met, are full time ministers.