Greyhound.ca "advanced ticket prices" = sneaky service charges!

Greyhound, why not just be up front with your fees?  Why wait until AFTER I have entered every last possible piece of ordering information, to spring an unexplained $12.50 service fee (for what?  if you haven't noticed, I'm ordering ON LINE...) on me?  Furthermore I invite you to review your accounting textbooks for how to do a "subtotal".  That means everything before the word "subtotal", not including your sneaky shit service fee:

BTW, after doing a second order, the closest guess I can come up with is that their service fee is $2.50 per adult per way and $1.25 per child per way (even though the rest of the child ticket costs the same as an adult's.)  This is based on a one-way trip for 2 adults and a kid being $6.25 for service fees, which doesn't divide nicely 3 ways, so I figured maybe they forgot that kids are 'full price' in Greyhoundland nowadays, or something.  I certainly wasn't about to enter all my info a THIRD time just to gather more data for analysis, when you should just TELL ME WHAT YOU WILL CHARGE.  Thank you.