Paul was bi-vocational. It was partly so that he could eat. It was partly so that he could support his team (Acts 20:4). I believe, however, that Paul could have asked almost anything he wanted from his churches support-wise, but instead chose to go where the traffic was. In the same way, the apostles in Acts 3 are visiting the temple during the time of prayer (Acts 3:1). Church planters go where the people already are.
Alan Hirsch talks about proximity spaces rather than centralized gatherings in church buildings. (p25 hirsch) If people are at a coffee shop, why start a Christian one? The name of the game is infiltration, and if you want to infiltrate people, you go where they go. You don’t ask them to come where you