If I ran the world, eBay sellers would not be begging their customers to leave five stars on each of the four feedback categories. They would not email them, and go on and on about how four stars is the kiss of death. Nor would they include notes in their packages, once again pleading with the customer not to leave anything less than five stars.
eBay has changed A LOT in the past 10 years. And not all for the good. I don't know if their star system, or their latest addition, the Top Rated Seller, will make much of a difference overall. For honest sellers who take pride in their work, ship quickly and safely, and treat their customers the way they would like to be treated.....well, it's just business as usual.