That is an excellent question! A full-time senior-level developer advocate or technical writer now costs more than $100,000-$150,000 annually, plus benefits (and good luck finding one available). Aside from that, you might not always have enough work to keep them busy all of the time, so you're stuck paying for time you can't use.   You can pause and resume your subscription as often as you need with the monthly plan to ensure you're only paying for your blogging needs when you have work for them.