In a system where logrolling is permitted, a third party may bear the cost of the project, rather than those who receive the full benefit of the legislation.
Voting results with or without logrolling will differ only if the minority is more interested in an issue than the majority, enough to separate the marginal voters from the majority.
Legislators, who seek their personal benefit via logrolling even though it may not benefit those who must pay for the measure, are known as maximizers.