Is it possible to make money from the web's ads??

Bill Thompson from the BBC wrote in [1] that according to ZenithOptimedia, advertisers will spend 448 US$ bn worldwide in 2007. That is just a lot of money, I can see why Google has an endless pocket. My question is how can I get a slice from that?. First I will have to build a really good and innovate web application or make a nice and useful website, so I decided to make some research, I found that Hal Varian (Chief Economist from Google) [2] says that 2% of ads might get clicks. So with that information I made an example: (I guess this could be the worst scenery).

Traffic (users per day)	% Successfuly clicks	Profit per click US$	Total US$ income per day
1000	2	0.10	2
5000	2	0.10	10
10,000	2	0.10	20
50,000	2	0.10	100
100,000	2	0.10	200
500,000	2	0.10	1000
1,000,000	2	0.10	2000
5,000,000	2	0.10	10,000
10,000,000	2	0.10	20,000
50,000,000	2	0.10	100,000
100,000,000	2	0.10	200,000
500,000,000	2	0.10	1,000,000
1,000,000,000	2	0.10	2,000,000

Your ads's income could start to be interesting if you receive 50,000 of people every day, that is 100 US$ (Google pay you checks since 100 US$). It can be disappointed, so much work to receive only 100 US$!!!, seems a bad a idea, but I still believe that I can do a better job, the idea is to make something new and useful, I will still thinking, maybe I will come up with an idea. If I am wrong let me know it.

References:
[1] http://news.bbc.co.uk/2/hi/technology/7125666.stm
[2]http://courses.ischool.berkeley.edu/i141/f07/
lectures/varian-search-engine-economics.pdf (page3)