Not sure if you are talking about business-to-business or business-to-consumer.  Both have their problems. I see comments from most people that it is a bad idea, and I agree.

You are much better off putting your money into social media, Internet or direct mail.

If you are cold calling, phone calling or otherwise working a list for business-to-business leads you should work from the bottom of the list.   Everyone starts with a list and if they are successful, they get promoted. If not, they quit. That leaves the next person to start at the top of the list.  As an advertising agency named Bagwell, I get my share of calls. However, if you are a welder named Zumwalt, you get very little attention. Start where you have the least resistance.  Who knows, Zumwalt may buy from you since nobody ever calls.