incorrect.
it’s confusing!
it’s not something the “client” can be charged for. it’s something the “end user” can be charged for.
e.g. My client wants a basic online brochure with some photos and contact details. This is fine under a Regular License. I buy a $60 theme and use it to build a website for my client, I charge my client $1000 for this website.
e.g. My client wants a dating portal where end-users can sign up for $5 and then chat to eachother. The end-user is charged for this product, so I need to buy an Extended License. I buy an Extended License for a dating wordpress theme and I buy an Extended License for a user/payment manager plugin. I charge the client $10,000.
Hope that clears things up a bit 
Also, Extended License is not a “multiple use” license. If I get another client who wants another dating website I would have to buy another Extended License for the theme and plugin I used previously.