You're also unlikely to find a great deal on a really special project on a marketplace. People who post on marketplaces like Flippa or MicroAcquire or SideProjectors (there're dozens of them) have either:
1. Realized the time it takes to maintain is not worth the revenues/profits
2. Realized the income is not sustainable and are trying to cash out at the end of a great run
3. Realized that some folks are willing to pay very high multiples and will list their projects at prices most (but not all) people will balk at.
If you're really interested in taking over a project that's profitable, network with people, do cold emailing, and find opportunities to take over projects that the owners are simply not interested in any more.
In other words, look for the elderly couple who is ready to move on from owning their profitable, outdated shop.