Almost certainly not
People who have installed the Technical/Consumer Preview will be able to upgrade to full windows 10 once it is out, even if you installed it on another computer, meaning if you did not install it on your main computer both your computers can receive the update.
What I did is use a loophole to get a vista laptop upgraded to 10 full.
After you finish the upgrade, you can opt-out of being an insider, as being a windows insider will stay probably for a very long time even after its released.