Show HN: The last person to use this button gets $200+ USD, via Smart Contracts

    // The winner is responsible for withdrawing the funds
    // after the button expires
    function Win() public {
        require(msg.sender == winner);
        require(now > deadline);
        reward = 0;
        winner.transfer(reward);
    }

That said the page is unclear in a few ways. What's the $1? Is that just to validate I have an account (meaning I get to keep it)? Is that the cost to enable the button, meaning once I transfer it I get unlimited future button clicks? Is that the cost per click of the button? Is that some inherent Etherium contract cost? Is there an inherent cost to clicking the button? If so, who set it, you or the blockchain processors?

It then brings up the next big problem. It's nice that you provided the source code foe the button (and I'm assuming hash so I can in theory validate the code against a hash), but how do I know the page I'm loading is even comnected to the code or the button? Or that the plugin isn't hard wired to empty my account?

It seems like you need a fully trusted chain for a user to have faith in the contract.

So it's basically a penny (well, dollar technically) auction of cash instead of a good?

    function withdrawTips() public {
        // The owner can only withdraw the tips
        tips = 0;
        owner.transfer(tips);
    }

Two reasons: 1) auditable code 2) transparent deposits and withdrawals

I'm generally skeptical of smart contracts' real-world use but this is a rare case in which an immutable, trustless public ledger is essential.

WTF? Screw you dude.

Don't draw the button if I can't click it! Don't say I can do one thing then force me to do another. That is bait-and-switch.

This is along the same lines as videogames showing DLC content you haven't paid for in the exact same way as the game's regular content. It's an obnoxious ploy to get you to buy the DLC, and they get to remind you of that fact every time you click it.

        reward += msg.value * 8 / 10;
        // Take 20% tip for server costs.
        tips += msg.value * 2 / 10;

Anyone want to do a a version of this with a 0.1% fee instead?

1. User deposits ether to contract (at least 0.001 ether)

2. Creator of this takes 20% for server costs

3. The other 80% goes into the prize pool

4. When the timer reaches 0, the last person to click the button gets the prize pool (well, actually 0, but...)

It would get very entertaining very quickly.