Completely false. People buy and sell SAAS businesses all the time.

1. Sure, bad businesses exist. When they do, they're priced accordingly or just can't find a buyer.

2. It's called an exit for a reason. There are million reasons to exit (eg: Big life event, wanting to cash out and invest elsewhere, bored of the business, have other projects, etc, etc, etc.)

Just because someone is selling a business does not mean it's a bad business. I say this as someone who acquires and grows online (e-com) businesses as my primary wealth vehicle.