Shopping is far less than ordinary. I just earned a pile of miles on CO that way.

My CO account was below 1000 miles after having redeemed for 2 BF tickets to Hawaii. This was mid October.

The holiday season came, and along with it, bonus shopping miles from CO for over half their merchants. I was also targeted for a different promotion for flying and doing other activities via the website.

FF to March. After removing about 20k miles for flights taken, my CO account is currently sitting at 90k miles. Most of it from shopping at the holidays.

If that isn't a good way to earn miles without flying, I don't' know what is, since there are so few other promotions as there were several years ago.