This is just informational discussion, but through my thought in theory this is actually possible.

First of all, using a proxy and clicking about 2-3 times, then changing to another proxy. Perhaps setting your server to automatically exploit this?

Secondly, using adsense in an iframe and refreshing it?

Surely Google must have methods of preventing this though?

My own suspicion on #1 would be that big G would be able to know where a large percentage of common proxies are, thus eliminating a big chunk of the problem. That, and people who go too far tend to leave a footprint. In other words, if I click 2-3 times on ads from one proxy, then move to another and click 2-3 times, then move to another and click 2-3 times, and my ads don't get clicked that often otherwise, that tends to show up.

On #2, an impression footprint would be left (in other words, as the ads rotated, impressions would be counted artificially and that would leave a footprint as well.)

In other words, I think in a large percentage of cases, these things would be detected and caught. Not all of them, but a good chunk of them.

Small scale click fraud is always going to leave a footprint, simply because most of the fraudsters just don't have the resources or the imagination.

If you want to steal money using adsense click fraud you have to think much bigger. 30,000+ sites showing adsense from several hundred accounts and a small army of WAH clickers around the world being paid peanuts per 100 clicks.
If accounts get closed another one gets opened using accommodation addresses or "virtual" offices.

Depends how small the scale is.

For example, webmaster A clicks on AdSense ads featured on his site from (a) his grandma's house; (b) the library; (c) the internet cafe.

Webmaster A is able to scam AdSense for $3 per month, and, while drinking his coffee at the end of the month he is warmed by a feeling that that cup of coffee is paid by Google.

You will get banned. Maybe not today but you will get banned. Scamming the system will only bring disapiontment. a life time ban on google is not even worth the risk even if it can get you a few extra grand for a month or two.

I definitely agree

OK, forget the fact that it's basically stealing money from the Adwords advertisers...Why risk your entire Adsense account for a few extra clicks a day?

Instead of wasting your time on setting up some elaborate click fraud scheme, just learn proper SEO. You'll see that a few clicks really isn't even that much once you do it the right way.

You think bad stop thinkg of such stupid things and work work hard that's the way money are made