You're not the only person here who think that asking for homework help is bogus; it's just that not everybody feels that way. The state of education today is such that teachers are burdened with so many non-teaching tasks and class sizes that are too large that the teacher can't teach everybody--all the while the fact remains that everybody needs what the teacher's trying to teach.
While laziness on the part of the student might be a factor, students have a lot to deal with under the current economic crisis and it's just as likely they don't have any time left in a day when dealing with other serious things in their lives too.
The deal is that even when a lazy person gets the answers to homework, they still won't learn and still won't pass. In the meantime, students with genuine problems and who simply need to keep up won't be tossed by the wayside.