Just noticed a typo in your post. You wrote:
If you have 10000 Steempower then your 100$ upvote is worth 1.7$
The typo here is that you have 100$ but it should be 100%. There's a dollar sign where a percent sign should be.
Great post, by the way! I haven't tried leasing Steempower yet, but I may still do it. You know, spread some goodwill here on Steemit.