I have similar story: corporate experience in process design and implementation and moved to consulting with idea of using knowledge and connections. What I realized I have no way to sell to big business. And s.m.b. don't use erp, let alone bpmn. s.m.b are quite happy keeping notes in spreadsheets and smartphones. Most of the market for bpmn comes from regulation and certification e.g. ISO certification requires processes to be reproducible and documented (with appr. software) and the list goes on say if company goes public and all of that. No s.m.b has this requirement, so there's no marketing to them.