Metropolitan areas it is easier. Expecting a 70% return in the rural midwest may take you some time with Craigslist.
If you do not want to use Ebay there are not many other choices.
The other aspect is time to sell vs the value of your time.
I took my 16-35 II, 300mm f/2.8 and 500mm to a local shop and sold on commission. I made 15 - 20% less than the going rates but it was worth it not to go through the hassle. The 300mm took a month to sell. They had the 500mm for a full year before it sold.
Even with commission I averaged 60% on the smaller lenses. 73% on the 500mm and 92% on the 300mm (I had bought it used).

But now the store has changed owners. I just sold my 5D II and 35mm f/1.4L. I gave it to my son in law to sell, I made him give me what B&H's quoted as an offer from the sell and let him keep everything above. B&H is probably about 50% of what they sell the item for. Then he went to ebay and searched the items and looked at previous sells and used that as his go by price to list on craigslist. It took him about three weeks before he found a buyer. he was able to pocket $500 bucks. I am getting ready to let him do the same thing with my 1D IV.

Selling is a pain in the rear.