Higure does have a point though...
If we can bring in non-magical people like the families of friendly magical girls, we could set up a far more effective support network. Ideally, this network would track witches, put in supply requests, provide funding, and coordinate the magical girls. It would save on magic usage since the MGs don't always have to go roof hopping to find their next witch.
Example:
Say a cop in the network notices that there is a spike in suicides, mass hallucinations, or missing persons in one area. He can flag that area for search with the magical girl teams in that city/region. The local magical girl can scout the flagged area for witch activity and report back her findings. A middle manager in a software company can track expenditures and organize the magical girls needed for the operation. A taxi driver in the know can provide transportation to the area of interest after they stop at the local grocery to pick up protective equipment, first aid gear, or mundane weapons. Finally, after all is said and done the status of the magical girls, their equipment, and their grief levels are reported back and indexed by the central office. If the need for more seeds is severe enough emptied seeds or even Sabrina may be sent to deal with the situation.