It would only convice people NOT to use their services. There are a lot of newbies jumping on the internet by the thousands, that do not subscribe to this train of thought, and those are the types of people that can be targeted. People use the internet to share and receive information. Now, let's look at a parallel situation, on land. Oh, and it DOES cost the recipient money.
Time is money.
I'm sure people could put a price tag on time they designate for relaxation at home. So, what's the difference between these companies' practices and bulk-email practices. I could tell you one difference. Bulk-email companies can unsubscribe recipients upon request. Try unsubscribing to MCI phone solicitations.