So, Paypal has decided to mine your transaction history and sell it to 3rd parties. You can turn this off, but this is yet another example where no rational user would chose this as a default. There are a lot of services which have so violated my notions of acceptable behavior that I'm on the edge of deleting my accounts outright. Paypal is now very much there.
You can (for now at least) turn it off by going to two "personalized shopping" preferences under data privacy settings.