And I think I'm a jerk if I dangle that I have a 24-70 F/2.8L I and do not let people have a look at it.
Attached advert from a guy who clearly has not sold much gear. Reach out if interested with a message.
Your ad contains too detailed information and niceties IMO for the eBay or Craigslist customer. My lengthy ads have fared much poorly than short ones.
You can, however, use this post in FredMiranda.com, and you definitely should. I have sold multiple items in that site and the transactions have always been very pleasant (and hey, I can put in a line vouching for the fact you are a regular poster in Canonrumors, FWIW). You can use Paypal which is very secure, and apart from the 3% Paypal fee there is nothing else.
P.S.: As Steve says, feedback on FredMiranda goes a long way, but everyone had to start somewhere, right? Some things that convince buyers are good English and feel of genuineness (I think your post has that), good pictures (put your username on a post-it and put it in the pictures), and prompt and clear responses if questions are asked.
+1 For selling on FredMiranda.com. I have bought and sold on eBay for many years with good success, but their recent fee hikes have forced me to look for other options.
I've been using CraigsList off and on for a few years, but we live in a small town so it's hard to find buyers close. Also, you have to deal with lots of thieves who make bogus offers at elevated prices and accompanying fake PayPal payment emails hoping to trick sellers into shipping products overseas. I current have a 430EX II speedlite listed on CL for $220. Yesterday, I received an "offer" for $350 including overseas shipping to ship to the buyers brother in Nigeria. But, it was urgent that I shipped immediately or they would not receive it in time for their birthday. Yeah, right! When I responded that I would not ship overseas until the PayPal payment had cleared the Buyer stopped communicating. These type of fake offers are common with CL and even eBay in my experience.
I have a friend who fell for one of these scams a few years ago. They were selling a collectible item on eBay. She received an inquiry from a scammer who offered $200 more than what the item was worth if she shipped to a relative of the buyer in Romania. The scammer requested my friends email/PayPal address and said they would send PayPal payment, but my friend had to ship immediately as their relative was moving to a new address in Romania soon. My friend was getting ready to leave on a business trip and in a hurry to wrap things up before she left. She received a fake email payment notification from PayPal and shipped the item to Romania without verifying payment at the PayPal website. The next day she did check PP, and no money received. She tried to contact the seller, but they never responded. Tried to recall the package from USPS, but apparently that isn't possible for international shipments. So, she was out a collectible worth a few thousand dollars.
Ive been selling a few items recently at FredMiranda.com and it's a pleasure by comparison with eBay and CL. The buyers are all legitimate and knowledgable photographers. Prices tend to be fair market prices and FM does not charge any fees, so PayPal fees are the only ones that apply. Those are not insignificant, but worth it to me to avoid the hassles on CL with scammers. I had a few additional questions from potential FM buyers since I lacked selling history, but I responded to their their questions and sent additional pictures as required. Some ask me to share my eBay user ID since I have a good seller rating there, and this helped. As others pointed out, you have to start somewhere.