Random thoughts on a rather strange post: You have one very nice Canon lens. If I had that lens I would plan on keeping it. If you're interested in investing, there are plenty of stocks that pay dividends. All digital cameras are disposable. They bleed value. They are replaced every year at most by something better. Lenses are forever. I have heard no rumors of Canon discontinuing the L mount. Camera brands, models and styles come in and out of style. When I started in journalism Nikon F5s were the standard. Then everyone ditched their Nikon gear for Canon's big, white lenses. Trying to guess what's going to happen "next" in photography is a waste of time. If there are any photojournalists left (sarcasm) I suspect they're using big Nikon and Canon dslrs. It doesn't matter. Cameras are tools. I have owned Sony, Canon, Nikon, Pentax, and Mamiya cameras in a mix of film, digital, with mirrors and withough. Right now I'm using a Fuji 6x9, totally manual, no-meter film camera made in 1969. You've got good gear. Stop sweating over whether it was a good investment. If you use it, it was the right thing to buy. If you don't, it probably wasn't.