First off, no, marketing is not where most of the money is spent. Second, marketing spend has a positive ROI, so they get more money back than they spent.

Lastly, this entire discussion is about a wonder drug that cures a terrible disease and you claim most new drugs are minor tweaks.

Or are you claiming that Europe isn't meaningfully free-riding simply because new drug development just isn't valuable, and we'd be better off with much less drug research? I think that's a defensible claim, but it's very contentious and should be stated clearly if you believe it.