The barrier of entry is simply owning a car. If you were offered $10,000 to drive someone for 20 minutes you'd likely do it. From there, it's just up to an algorithm to find the right number.

If someone offered me $10,000 to drive them 20 minutes then I would assume that they're transporting contraband or fleeing from law enforcement. Sometimes high prices are a signal that something is badly wrong with the deal.