“If you’re a freelancer, you are allowed to create an end product for a client using the regular license and charge them for your services”.
“I’m a freelancer. Can I use the item for an end product I’m doing for a client?
Yes. You’re essentially buying the file on your client’s behalf. Whether a regular or extended license is needed will depend on your client’s use of the end product. With both the regular and extended license you are allowed to charge your client for creating the End Product. Once you transfer the end product to the client (eg giving them source files for the item), be sure to link your client to our licenses and delete the item itself from your computer.”http://themeforest.net/licenses/faq
Thanks! Now I finally understand how this works