We sold our 1000 copies of our first CD (released in 2013)... it took us 5 years. Actually, we still have a box, so there's less than 30 left, but close to having sold all).
Then in 2015 we released our second. I think we've sold about 200, and given away another 200, roughly. We sell very few online. We sell far more download-only versions. The best place to sell them is at gigs. However we generally forget to bring them which is why so few have been sold. We tried harder with the first one.
We're about to release another one, and we're considering not having physical copies. But we really like to have a physical copy, with the artwork etc etc. We may just get a lot fewer made, but the cost barely goes up between ordering 500 or 1000 copies... Commercially, however... we don't find they fly off the shelves exactly, so best if you have a good storage space
I think it's still good to have some that you can give away. We want people to listen to us,even if we have to bribe them