I use CL exclusively. You need to decide what you're willing to take. Personally, I only buy for 70% or less of the current new item price. I've had good luck selling at 75-80% of new. Include good pics in your ad, product -type pics ('seamless' white background, a piece of paper works just crop tight). Ask for a phone number in the reply.
LOL. Now I know why I feel the resell value of my gears were so bad.
Indeed. But, I should say that buying used is how I 'test drive' lenses. I've re-sold far more used lenses than I've kept (in one case buying a new copy of the lens, but that was the 24-105, which was break even at the kit lens price) - that's why I only buy 'cheap'. I get to try the lens for as long as I want, and usually for no net cost (and several times, net gain!). Plus, I can afford to wait for the good deal, and have cash to jump on it when I see it.
Great idea to try some gears. I want to try some lenses which I don't really need. Maybe this is a good way to let me try them. Thanks for sharing the idea.