Is it worth direct mailing to "slumlords" or other investor LLCs?

[Amber H.]

Hi, BP!

I'm starting a direct mail marketing campaign and am curious. I get a little heated when I find properties that are owned by other companies, investors, or the like and they are not taking care of the property and it doesn't look like they have plans to (based on time frame of ownership). They do not want to make it better, make the city better, nor help create a better standard of living for their tenants. Many of the properties may actually be vacant, from the looks. 

My question is, is it worth direct mailing to these people? Before I spend my money to get them to sell to me... why would they want to sell if they have a tenant in place and they don't care to change anything about the property? What would make them "motivated?"

Thank you in advance, 
and I don't mean offense by saying "slumlord," in case that bothers anyone. It's just easier for a short title.

Amber