Well gosh, I don't remember signing a contract, just clicked some button to make that stupid wall of text go away so I could use the software after I already paid for it.
I never met a human (excluding lawyers) who actually has read through a single EULA, and I doubt most of them would be valid if actually tested in court, at least outside the US.
It is pretty absurd when you go to use your Facebook app or whatever and are presented with a 73-page wall of text that you are expected to read and understand before going on to use the app. If those things are legally enforceable, then something is definitely broken.
Edit: Often it's not even at purchase. There are numerous apps that will do this every time they change their terms. And they don't show you a change list either. It's the whole 50-150 pages. No reasonable person would actually read it.
I never met a human (excluding lawyers) who actually has read through a single EULA, and I doubt most of them would be valid if actually tested in court, at least outside the US.
[edit: typo]