You can add as many as you wish, but I find kinda annoying the new ad creation system.. It has some limits and requires much more time..
The answer could be unlimited. But be careful, Google will look out if you put code into too many sites
As many as you want, but if they are making a bunch of money I would open more adsense accounts under an llc as you dont want all your eggs in one basket...
200 channel you can add into your google account. However, you can email to adsense team if you want to make it 500.
Well basicly, there is no limit about how much Website you can add to your account you will just need to put you code and you can start earning money from it. However, Google is allowing you to have only 100 channels, who will let you which are giving you most of your Google winnings. Hope I helped you.
If you have a lot of sites do you have to make channels for them? or can you just use the same code over and over? I knot the add colour needs changing etc but can you just use the same code? is it important to use channels? cheers mrix