Most sites/writers use "free service" as bait to lure desperate students. Let's face it, there's no free lunch. Good writers spend significant time on writing quality papers, which is no cake wake. It's hard work and it's only fair to pay them for their services. Everybody has bills to pay! ;) That said, students have to choose whichever service is affordable and suits them the best.

Plagiarism is a dormant issue and if students subscribe to "free" service, they'll obviously get "used" content. There are lots of great sites that offer services at a competitive price. Also, this whole idea of "students are cheating the university by buying assignment" idea seems like cynicism to me. Let's face it, there are times when even the best of us need support when we are at our wits end. So, I don't think it's a "sin" to approach others when in need. The number and popularity of sites that offer assignment support is increasing. This only means that there are takers for such services.

All in all, approaching an established service provider (who charges a few bucks extra), is any day better than being fooled by sources you can't trust.