The 99c vampire romance novels on the Kindle Store don't undermine Stephanie Meyer, they reinforce her status as a thought leader. The waves of Apple-derived industrial design (here's looking at you, HP Envy!) entrench the status of Jony Ive as the only designer that matters. Counterfeit designer clothes and accessories are the reason that luxury department stores in London are now employing Mandarin-speaking staff.
If you're not delighted that people are ripping off your ideas, you've badly misunderstood the modern market. On the internet, the worst thing you can be is ignored. Imitation means that not only is your idea good enough to notice, but that it's good enough to slavishly copy. The clones might get a few hits or a few bucks, but the social capital is all yours.