In the US, you could easily argue that you were unaware of the EULA and want your money back.

If the company refuses, then they are pretty clearly violating contract law. ("By the way, if you read this far, you owe me $10" is not a legimate contract, because you are forced to agree.) If that is the case, then it would be completely reasonable for the courts to render the entire EULA invalid, and fall back on first sale doctrine (no restrictions on the copy of the software you bought, etc, etc.)