Anyone needs to promote their Business the easy way?

Question

you know lotta people who own or start a home business needs to promote their business/ service by buying opportunity seekers mailing addresses. But why don't people buy emails instead, i feel like emailing is much more cheaper and easier. i mean you don't have to buy postal stamps to send anything. Here's a website http://qualitybase.org/emails.aspx i bought 100,000 emails for only 5 bucks.
hell i think thats very cheaper than the $24 that i used to pay for 300 mailing addresses which 60% of them is fake.

And pls let me know if you find any other cheaper way.

Answer 1

is that legal?

Answer 2

Gee, thanks, now I know where all that crappy spam came from!