Buy a shirt off someone's back using Ethereum

BuyThisTshirt.sol

contract BuyThisTshirt {
    address currentOwner;
    uint price;
    bool forSale;
    mapping (address => uint) payouts;
    function BuyThisTshirt(){
        currentOwner = msg.sender;
        forSale = true;
    }
    function buy(){
        if(msg.value < price) throw;
        payouts[currentOwner] += msg.value;
        currentOwner = msg.sender;
        forSale = false;
    }
    function getPayout(){
        msg.sender.send(payouts[msg.sender]);
        payouts[msg.sender] = 0;
    }
    function setPrice(uint howMuch){
        if(msg.sender != currentOwner) throw;
        price = howMuch;
        forSale = true;
    }
}