I think quickmeme's (and its ilk) success (well, besides the part based on vote-manipulation) is a great example of how smoothing a couple of steps in an otherwise mundane and everyone-knows-how-to-do-it process can be a real product. Having to make an image via quickmeme, then copy-paste and click over to imgur, and then upload it to Reddit is a trivial set of steps...yet, those steps add up...and for many users, it's just a matter of time before the labor of the steps outweighs the impulse to post a meme...and then, the volume of memes will be dampened
(OTOH, if it takes more work to post a meme, then maybe only the good ones that people make the effort to post will be seen)
That's not true. They DO layer a transparent PNG on the image, but that transparent PNG has no content whatsoever. It's there just to prevent people from hitting right click and "Save Target As."