Frustratingly, the more common doubt is "if it's so good, how are there so few people doing it?" Do you think that 15 years back it was prohibitive from a cost

Frustratingly, the more common doubt is "if it's so good, how are there so few people doing it?" Do you think that 15 years back it was prohibitive from a cost perspective now? Was it always this economically viable? I mean ~ $200 a panel, it's a true no brainer, maybe the initial outlay was a little too much for people way back when? On the other hand, I guess with peaking electricity prices in many parts of the world, it would've easily paid itself off by now for most people.