Respected Sir/Madam, I have one query I was interested in buying a Website which was already having active Adsense Account and after purchase I will put my Adsense code into that website. Will Google Adsense BAN ME or NOT as the website was earlier containing the Adsense Code of different publisher and now I am putting adsense code which is different.So,the website actually run 2 different adsense account on different time i.e. Earlier before purchase(some one having his own adsense account was using) while after purchase(I will put my adsense code). This activity will Ban me or Not Please Guide Me. Thanks in Advance.
Why would you not remove the already existing adsense code from the site you buy and then put your codes? Google's policy allows one to use multiple people's code on one site, but only one person's code per page. One site can have multiple people's codes but one page can only have one person's.
It is better to use a single publisher ID. Remove the current codes and use your own for better results. Why make things complicated?
I don't think google limits on how many USERS can put the same ads, in the same page! The only thing they would care is to not pass the number of ADS in a page. About the account changing, yes, you can put new adsense in the new webpage which has already had another adsense account. Just make sure the page hasn't been BANNED, cause that may cause you some troubles.