FYI - it's "brass tacks", not "brass tax".
I think "serial novels" are a brilliant idea...and if done well and the value is there, then I have no problem buying individual "episodes." In fact, I am doing that now with another author: it's a 10 part series, one "episode" per month for the next 10 months. Personally, it keeps the novel "fresh" and exciting in my mind.
The only question I have is: do you already have the other parts "scheduled" and how long is the first part? I may check it out.