regular license will be fine but for 80 different website you will need 80 license. Each license will work only for one individual end product (website). with regular license you can sell products and also can sell the website to your customer but for each sell/website you will need individual unique license.
Which license do I need for an end product that is only accessible to paying users?
If the end users need to pay to see the end product, you need an Extended License. There can be more than one end user as long as there is only one end product.
Example: A website that requires money before you can access the content