The fundamental issue here is that work is increasingly shifting into knowledge work, and knowledge work requires personal relationships and trust. Even assuming you can somehow bridge the trust and fraud gap to create a viable micropayment system for this work—and that's one overwhelmingly huge if—you still have the problem that the newcomer doesn't understand your company culture and the nuances of how you do business.
The idea that there are people out there who can magically solve your company's problems is horse shit. The few really talented people who would "get it" and hit the ground running probably are already super busy. Otherwise people need time to learn how to do the job. In a startup this is done with (hopefully) a smarter tight-knit team iterating rapidly. In a huge company this is done by policies and procedures laid out over time to allow people to be more interchangeable. But in either case you need long-term personal relationships for the employee to realize their value to the company.