Using a free blog service is a lead indicator.
Like an indicator that a bum is using a library computer.
An indicator like that.
Your very nametag is an indicator.
That's like saying I should pay app designers $3.99 a pop to use their software when I could get their free version for nothing, albeit dodging a few ads and not having full access to all the goodies I wouldn't use anyway.
So it can't just be a matter of what website I use; that's too global, huh? What other factors would warrant lumping every single blogger into the “dirty, drunken bum” category?