It gets better if you think of it the other way around. The only thing that keeps you from selling as many copies as you want in the first place is copyright law, which gives that right to the author. Since copyright law explicitly does not grant the author the right to control sales beyond the first sale, it is not within the author's rights to prevent such sales no matter what he puts in a EULA.
But doncha know copyright protections are only for corporations, not users..
A funny story.
About 5 years ago I paid close to $1,000 for a bundle of Adobe software. It worked great.
In January, 2007, I decided to upgrade to the latest version. I called the Adobe’s tech support and asked which of the latest upgrade versions would be compatible with my older package. He told me and I bought it for $750.
Two months later (In the interim, I had moved.) I tried to install it and it would not work. I called the company’s tech support. He checked my original software’s serial numbers and they were valid (I had registered them when I bought it.) He then told me that I had bought the wrong upgrade. I asked to exchange it and he said that it was outside Adobe’s 30 day window so I could not exchange it. I asked for a supervisor and was told that one would call me within 48 hours. No one called.
I went to Adobe’s website and filled out a complaint form. Several days passed and I received an email stating that they were closing out my complaint unless I wanted to re-register the complaint. I re-registered the complaint.
In the meantime, I bought an illegal version from overseas. It works great. I went back to Adobe’s website and added to my complaint what I had done. The next day I received an email stating that since I was now satisfied with their product, my complaint was being closed.
What utter fools. In the future do they think that I’ll ever buy their legal upgrades which don’t work when I can buy much cheaper illegal ones. Service in America is going down the tubes again.