I don't think it's necessarily a laziness thing. It depends on the situation. In some online forums and other sites, it is actually more acceptable to use "netspeak." However, there are some situations where netspeak is inappropriate, for example when writing a resume!
If a person is spending a lot of time writing on forums, it is quicker and easier to use netspeak. The same goes for instant messaging, etc. Of course, this type of language would be inappropriate for a hub! I think the problem is that some people think it is appropriate to use netspeak all the time, when they should take into account the context of where they are using it.