You haven't made any points, though. Not really.
The studies have shown that it costs more to execute a criminal than to incarcerate them for life, and one of your "points," verbatim, was:
3) The cost to execute them? Really?...totally insignificant compared to feed and house them for the rest of their lives.
That doesn't really give me, or anyone else, anything to refute. It's the rhetorical equivalent to "nuh uh."
Incidentally, if you were able to link me to a study from "some right wing pro death nutjob blog" that showed it was more expensive to hold a prisoner for life than to execute him, I'd gladly consider it critically and comment on its merit or lack thereof. My guess is you wouldn't be able to find those figures even if you looked. From a financial point of view, the deck has been pretty stacked against execution for decades, and as a result most organizations that support the death penalty (that I know of, and I don't claim complete/universal knowledge on the subject) tend to make their argument by obfuscating and/or distracting from those figures, rather than refuting them.