In Google Analytics, more than half of my traffic is from referral spam. This has a dramatic impact on my bounce rate -- which many sources claim is strongly tied to search ranking by Google.
I can negate a small amount of this by blocking the requests that actually visit my site -- but these are the minority. A lot (~80%) of the undesired traffic simply sends the necessary JavaScript call to Google to fool their systems.
So my question is: should I care? Does it actually matter outside of messing up my view on Google Analytics (that can be trivially dealt with via filters)?