This is the crucial mistake:
"How much time does a bootstrapped company take? All of it."
That's not true. What a startup (bootstrapped or not) takes is 100% of your performance, not 100% of your time. And optimizing for performance means spending some time on maintenance.
For the same reason, it's not good to live on junk food. It makes you less productive. The best food for founders is probably rice and beans. That's what we lived on during Viaweb.