I get it. There will always be a way around the system, but if you combine 1 / 2 with 4, it should encourage more users to read through the story. In terms of beating 4, you could always have an upper end (e.g. > 10 minutes without upvote gets the same payout as upvoting from home page). Bots can be created to beat any complex logic developed, but it could be a beneficial model for the average user.