No CD patching. Thoughts?

Lets say you have paid for a game (that needs the disk inserted in order to play it), and you have lost the disk or just find it an inconvenience to put a disk into your PC every time you want to play a game. Is it okay to download a no CD patch from a torrent site or wherever you find it, or is it wrong to do so? Is it against any rules? I feel that as long as you pay for it, you should be able to do what you want. But I may be wrong. Just wanted to hear some opinions. 

It is probably against the EULA but I do it anyway with some of my older games that I still have