COMC is the only site I will sell on. I was a Hardline nonseller for my first 28 years in the hobby but then I had so much fun buying on there, I figured that other people might enjoy buying my duplicates more than I enjoyed just storing them.
So far I've sent in 200 cards, sold 80...and bought more than 800. Every time one sells I usually buy another within 24 hours, lol. I originally planned to save up what I got for selling and get an Eminence card, but that lasted about 5 minutes until I found some card I had to have.
Each and every card on there is priced by the seller, so saying it's overpriced is just wrong, for the most part. I've purchased autographs for under 30 cents, for example. There are SOME sellers who have insane prices, sure, but you can find that anywhere. There are a couple I won't buy from because of their pricing.
One thing that is true...they don't always have full details listed, especially for NASCAR and Non-sports. There are mislabelings (wrong year) and question marks in place of a person's name. Sometimes I've found cards that I ended up purchasing just by pure luck. They also list some cards that are not numbered as serial numbered. They also have not fixed them when I have sent corrections.
The best thing about COMC is that you can build orders over a long time and then pay one flat shipping fee, a very reasonable$3.99 no matter how much you are shipping, and sometimes you can get it for free. If you have them ship 100 cards in s month they give you $5 for free on the 1st of the next month as well. I've completed about 25 sets on there, got cards as old as 1895 and as rare as 1/1.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):