Advice from cycle couriers sought

Hailo for couriers?

Would the couriers be compelled to take the jobs that are longer distance and to areas out of their usual vicinity? As the ability for a courier to make money under this is based on their proximity to the next job after completing the current one.

How would distance (from the epicentre of most jobs) be rewarded accordingly?

How does it work at the moment? Is it charging done purely by distance or are they zones (sort of like the Tube) or some mixture?