How many parallel agents can one developer actively keep up with? Right now, my number seems to be about 3-5 tasks, if I review the output.

If we assume 5 tasks, each running $400/mo of tokens, we reach an annual bill of $24,000. We would have to see a 4x increase in token cost to reach the $100,000/yr mark. This seems possible with increased context sizes. Additionally, we might see additional context sizes lead to longer running more complicated tasks which would increase my number of parallel tasks.