I don't care about that really. If you just want to get laid, fair enough.
Love can develop out of lust, too, I suppose.
I just don't like the "information dump" nature of these websites.
If you list your favorite things point-by-point, you're being thorough (most people aren't) but by doing so it encourages "shopping around" and discourages the natural courting process.
By that I mean that online dating prevents you from discovering mutual interests in a natural and organic manor, through the regular course of human interaction and verbal communication.
With digital/non-verbal communication; you can't see the person/how they react, detect their tone and inflection, or explore the depth of their knowledge as easily. You can't seduce or flirt as easily and thus prevents you from making a connection. Unless you're a good writer, you can't really inject too much charisma into non-verbals.
I don't know, it's convenient in a sense but in my experience, generally counter-productive to finding someone for a potential relationship.