Im not the guy you wanna talk to about whether seeds are worth the money they call or not lol.
You will usually get large, vigorous, yieldy, and impressive plants from F1's, but every phenotype will be different, and often like a completely different strain. So long as the plants chosen in the F1 generations are wise choices though, you can usually end up with predominantly fantastic phenos that all make quite unique flower. If you want to keep one in particular around take clones. All of the best phenotypes, hell the best genepools entirely ive ever come across and run personally were F1's. Every single one of them.
If you're looking at the RQS F1s or something, i can indeed tell you that there is a LOT of time and work that actually goes in to delivering an F1 lineage you can confidently say will deliver the kind of plant someone may be after. Whether the seeds of a plant that can make 10s of thousands per plant are worth money? Different question entirely to me. Depends on why you are doing it, and what you are after as a result.
Not that non-F1s arent great plants and frankly AMAZING for hunting down specific traits you are after though. But when i want to find unique plants to keep around a while and call mine, i make F1s out of those highly desirable and specific plants and hunt them for something special. More vigor, more disease and pest resistance, faster flowering, higher resin contents. All very common with F1s. But you also sometimes get super quirky, or crappy plants too. Theres a small dice roll involved.
I will say its been a long time since an F1 bully dog didnt win a dog long jump, or an F1 thoroughbred horse didnt win the Kentucky derby lol.