It has become popular lately to show fees imposed by pothers as a separate line item in many invoices. Sort of a way to say "It's not ME that is making this so expensive". For example, my phone, electric and water bills show various local fees and taxes, sales tax is shown separate in almost any purchase, etc.etc. It also lets the seller advertise a lower price, with a "plus taxes & fees" in fine print.
One of my first Rvs was used but I found the original invoice in the papers that came with it. There was a line item for an RVIA seal for $3.00. Yes, that was a while back...