The SteemPower (which your STEEM transferred to your “Steem Saving Account” or “Power Up”) makes your upvotes more valuable. E.g., if I, with my meager 650 SteemPower, upvote someone’s post, it increases that post’s earning by 1 or 2 cents. If someone with much more SteemPower than I upvotes that same post, they can increase its value by a few bucks. Get it? Buy yourself some STEEM and then Power it Up. Your upvotes will be so much more valuable then and people will follow and upvote you, hoping that you will reciprocate. Easy, uh?