You can either be a professional in the sense that it is your main source of income, i.e it is your profession, or you can just ride to a professional standard - money has no involvement. However, if I was making my living from riding demos, I'm not sure I'd say I was a professional trials rider, as generally speaking Demo riders standards are a lot lower so it would give across the wrong message. Maybe a professional demo rider? I think you'd lose a little credit from others in the trials community if you started professing yourself as professional. Then of course someone says "but I can sidehop higher than X, I guess I must be professional too!", and then before you know it, everyone's a pro Perhaps you make some money from trials, you've got some sponsors and your standard is pretty well above average - then perhaps consider yourself semi-professional? Then it kind of fits the bill in terms of finance AND standards. It's all academic anyway. If you want to tell a member of the public that your professional after they've just watched you for twenty minutes, where's the harm? They go home with a sense of well-being that they've just watched a pro at work