Cost Per Click and Sales Conversion; Normal Range?

Hi:

I'm trying to form some reasonable expectations for internet advertising costs and results. I must be misunderstanding something because I'm having trouble understanding how people make money selling with normal tools like Adsense.

Its my impression that if you want a good placement using Adsense you need to pay {content}.65 to .00 per click. Does this sound right?

While the click-to-sales conversion will vary depening on what you are selling and what traffice you are getting, 0.5% to 2% seems to be the normal range. Is this true?

Assuming you do get a 1% conversion, and your cost per click is .00, that suggests to sell one unit of whatever you are selling you need to spend 0. Not many products have enough margin to allow you spend 0/unit on advertising, so I'm guessing some of my figures are way off.

Can anyone lease help me figure out where I'm going wrong?

Thanks

How can i control the High CPA?in PPC Marketing? Any Suggetions Please?

I am very new to this PPC Marketing, from past 4 months i am working on PPC, the questions is : i am getting good CTR and even good traffic, but the CPA or the Cost/Conversion is high compare to the assigned goal.[like:Max:] but mine is running under , so please any of u have got any suggestion to controll the CPA, i am at the door step receive ur answers and suggetions, and because of this i getting scolding from the company manager, so plase do help

thnks