I don't need to show you anything, I'm not the one telling everyone that what works for them doesn't work. I do know that using mailing lists such as you suggest wasn't successful any time that I've used them, they ended up being a waste of money.
I have worked for ad agencies and PR firms (with clients ranging from AMD to Dunkin' Donuts being our primary clientele). Currently I work for a small pharmaceutical company that deals not with the public but with other pharmaceutical companies providing radiopharmaceuticals and reagents for laboratory testing. Your "expertise" is hardly useful to me.
You have yet to provide a single example of your "success". Scott, however, seems to be well respected around here, and has shown himself to be successful. You . . . well, we've all seen what you've done.
As to how not to spend money . . . well, if ScottWax spends $50 to make copies of fliers and $100 to distribute them, then gets even 50 clients from that investment, he has spent his money wisely.
If someone spends the huge amount of money to make your fliers, acquire your mailing list, pay postage, then see mails returned because they're no longer valid and gets that same 50 clients, they have not invested their money wisely.
That's kind of the way it works.