There are some I read, mostly from small local businesses I’m rooting for.
The really big corporate ones I don’t know, though. I skip those too.
I can tell you from personal experience learning about email marketing that it’s considered one of the most effective marketing tools out there, so yes it definitely works. It’s a percentages game, though. You send out 100,000 emails and maybe you get 1-2% click through. That’s still 1k-2k people who went to your website who wouldn’t have without it, all with very minimal cost to the business.