Sometimes I see websites that are published only for Google Adsense and that are using the Google Adwords. Can we increase Adsense incomes with sing Adwords? Can our incomings exceed the outcomings? Have you got any experience about that?

Doesn't sound very likely to me.
Look at CTR and the fact that buying clicks cost more than the publiser gets paid for clicks.

If you have a ctr of 1% you would need 100 visitors to pay for the one visitor you will get from adwords. Even if ALL of your visitors click your adverts you would only break even, at best.

I dont believe that it's possible. Never incomes from clicks can afford Adwords costs.

Don't forget that ads pay differing amounts. If he's using cheap adwords, and getting high paying adsense it wouldn't be so strange if the income exceeded the expense. Just have to play the keywords right really.

If he was using cheap keywords for his adwords, and content that would give him high paying adsense adverts he would be getting untargeted visitors.. nobody would click the adverts.

Would be better off buying 1000 untargeted visitors for $3.
Still wouldn't work though.

It certainly wouldn't be easy to pull off, nor a good "get rich quick" scheme. Users are searching for a particular product - they don't want to be flooded with ads - or at least, if they are flooded with ads, they want them to be relevant.

Therefore, if a user clicks through to your adfilled site, they're more likely to hit the back button and click the more relevant ads.

Aside from the fact that it's against Google's TOS to create a website with little content other than ads, it's a bad idea because, as mentioned above, you'll probably get paid less than you'll pay to promote the site.

Used in context, Google's ads can be a great source of revenue. Just use them as both Google and the people paying for them would want you to, and you'll do well.