Yes, but shouldn't I be making more even money by using these services to optimize those other things? If, say, Calendly helps me get booked for appointments, appointments that wouldn't have happened without that app, then isn't that spending money to make money?
If you think so, it's probably true. That's why I can't really disagree with parent :D
I find the cost and value of tooling options quite difficult to fully grasp, it often comes down to gut feeling IMO.
What I would want to caution folks for is that the cost of a tool is not only what it actually costs. It's also the amount of time that has to be invested into usage, and potentially migrating to something else a while down the line in case of discontinuation, disappearing capabilities, new requirements, ToS or pricing changes, ...
