Biggles.
Putting aside, for a moment, the legalities and obvious points of ATPL-v-CPL-v-PPL in terms of skills and safety let's go back to the time when you derived an income from that motorcycle courier business.
Now let's imagine I approached all your customers and said I'd deliver their stuff for only the cost of running my moped. You, not surprisingly, stop me in the street and ask me what the hell I think I'm doing and I reply that it's ".... not commercial and therefore no threat to any of the motorcycle courier businesses".
How does it sit with you now?