A ponzi scheme can have offices. People should differentiate between ponzi and pyramidal schemes.
I will agree with you here that a Ponzi/Pyramid scheme can have offices everywhere just to pacify prospective customers to invest in their Ponzi. CBEX had an office and today what happened?, where are they now?. The truth is that people are just being cajoled into doing things because of what they see and they forget to understand some certain principles as it bothers around investment.
Years back in my city there was an organisation that came and they had branches in the state, they claimed to have multiple investment stream to sustain their existence and guess what? It was a family member that brought them and to her consciousness she wasn't in the know that the organisation is a Ponzi with unrealistic promises but after we visited their office and I heard from them directly, I wasn't convinced to go any further. It wasn't upto a month she called me and told me what happened, lucky for her, she has already recovered her capital and it didn't bother her when they absconded but some of her downliners wee be trapped.