Its like a random draw - by getting on the list (having a post or reblogging a valid post), gets you a draw! We reorder the list 'randomly', and the one who comes out on top gets an HSBI unit! If yours is a reblog, you get the unit, but the reblog gets the votes.
As to your follow up, it is a great idea for a post, its going on my to-do list!
Okay, good to know. Thank you!