Can't paypal and google just get along?

Like anyone I want to be able to track my conversions based on goals I set out. My goal is for people to reach a "thank you for ordering page" right after they submit payment. Simple no? If they reach this page my google analytics "goals" should count that as a conversion.

Google is so off from the sales registered in my paypal account that it's not even funny! I mean huge off. So far, if I believed google, I had 1300 viewers follow through my "funnel" to the purchase page. Google then tells me only 3 people ended the cycle on the thank you page.

Paypal of course tells the real story - the truth is in the bank - as they say. So why isn't paypal bringing people to my thank you page after submiting their order like I asked them to (actually they offered in the button customizations).

• Why is google obviously counting people who "checkout" as "exits" (from my site to paypal BEFORE the sale).
• Why is it that I can only customize the header image and background color in paypal buttons?
  
• Why can't I put my google tracking code on the paypal payment page...(hmmmmm)?

I could just pull a Bobby McFerrin "...naaa na na na nananaaa dont worry...nannanaaaaaa...be happy" but I really would like to take advantage of googles other tools like "website optimization" where I can create test pages. Find out what converts best - how best to present my Ring Guards to my customers - lots of neat stuff.

If you know I'd love to know.

:)