Photoshop replaces art

I wonder now if my street art will be replaced by photoshop.
See, now instead of making art in public, I can sit on my computer and merge 2 photos together to make it look like I did a piece already. And no one but me would really know. Am I wrong?
I mean, 90% of my work leaves no trace anyway. And "no pic, no proof".
I feel that I shouldn't even dare to think such thoughts,
but I consider it a lot lately.
All I really want is a picture, right? That's all I have left. Why not skip the steps in between? Why not just make a picture without making the work. It's way more efficient, safer, makes people happy that I didn't ruin anything, yet I still get to keep my audience.

Now, I need a good rebuttal.

Lost and found

Lost: guts. When: these past 3 days.
I don't know if it was salmonella, but it could've been. Other than mono, that was the sickest I've ever been. When I am sick, when I stop puking my guts out, I always want candy. And fried donuts. So I had some chocolate ice cream and gummy bears. Then I started puking again. I tried to get mom to take a picture of it, but she wouldn't. It looked like paintings I've seen. (:

Lost: cell phone. When: about a week ago.
I guess I haven't really looked for it. But tonight, I really tried. I didn't find it, but I found a lot of other good stuff! Like my stamps, and a zip-lock bag of stuff (aka, yes stuff. memorabilia, little scraps).

Which makes me wonder how I do my art. Which comes first, the stuff, or the idea? And why does it never seemed to get more narrowed down?