Responding to Lazy Applicants

[Account Closed]

I was just curious about how other people handle the lazy prospective tenant.  For instance, an email through craigslist simply stating "I am interested in this home".  No questions or anything - just a simple statement.  Another example would be an email with obvious gramatical errors that the prospective tenant didn't take the time to correct.  One more example that comes to mind is the missed call with no message.

I've generally been ignoring  these types of inquiries.  I don't feel like I should put more effort or time into a response than than they put in to their inquiry.  I also assume that someone that puts such little effort into an inquiry would tend to put the same amount of effort into keeping the house clean and well maintained.  Should I change my approach?  Am I missing out on good leads?