I generally agree, except the caution points on the graph. It is possible "few people use all the time" is a big time-waster for you. Or it is a break-point b

I generally agree, except the caution points on the graph. It is possible "few people use all the time" is a big time-waster for you. Or it is a break-point between tiers and you've really identified power users that you can charge more.