[EVM] Sponsored, inefficient with push/pop

gistfile1.txt

pragma solidity^0.4.19;
// like a less-liquid GasToken
contract Sponsored {
    uint256[] wastedSpace;
    function sponsor() external {
        wastedSpace.push(1);
        wastedSpace.push(1);
        wastedSpace.push(1);
        wastedSpace.push(1);
        wastedSpace.push(1);
    }   
    modifier sponsored {
        _;  
        if (wastedSpace.length != 0) {
            wastedSpace.pop();
            wastedSpace.pop();
            wastedSpace.pop();
            wastedSpace.pop();
            wastedSpace.pop();
        }   
    }   
}