You bumped into your ex-colleague Allen Smith at a nearby supermarket. You struck up a conversation, and he spoke enthusiastically about his upcoming business. He is in the middle of plans to open a fitness center in your neighborhood. Throughout your conversation with him, you noticed that he did not mention a proper product feasibility analysis. It seemed that he was blindly forging ahead with no proper planning, especially on  service matters. As a friend, advise him on the most critical issues he should consider when completing product service feasibility?