Divvy--yes, your question makes sense.
Unfortunately, as far as I know no one has been able to dissect the points booster formula. I have myself tried watching the number of calories burned given on different machines and my own judgement of how hard I'm working, to try to get some idea, but it's been hopeless. Given that every person perceives themselves as working at different levels (hard for me is probably not hard for you) and that every body actually burns calories at a different rate, there's really no way to say exactly how many calories is equal to how many points. Instead of being concerned about using the slider, I go by the 20-minutes-is-1-point rule (when I actually use exercise points).