I use UTM parameters to know specifics about where people are coming from. From what I can tell, this is really on good for landing pages. If the user does this:
landing page >> product page >> checkout >> paypal.com >> product thank you
I won't know which source they came from since the UTM values are lost once they hit the product page (its URL doesn't have UTM parameters).
Is my reasoning on this right? UTM is really just for one page and cannot trace the path of a user through your site?