Funny argument. ;-)
Actually you do all the time. It's a game - you don't know if you'll like it. You may read a review and get a general idea whether it's good or not, but your subjective impression may differ.
Same goes for movies, books, food in restaurants etc.
With hardware you have the luxury of having benchmarks that tell you how it performs. And samples give you a very good idea of what to expect in image quality. So before buying you can fairly easily say if RTRT is worth the premium.
Adoption is a different matter. And here's the thing. If you're a casual gamer without brand preference and not involved in brand wars, by now you should be fairly convinced RTRT is going to be mainstream pretty soon. Nvidia can accelerate it. Next get consoles will. AMD will as well. Most big game studios either offer/develop it already or openly admit it's coming.
But among hardcore AMD fans (i.e. anti Nvidia) it's still a common theory that RTRT will fail - just because the other company started the revolution. It was strong initially, but it's still strong now - when we know that in 2-3 years every new gaming PC and console will offer hardware acceleration.
That's not true as well. Again: very biased opinion, but this time not because of your brand loyalty but general approach to gaming.
People on this forum tend to game a lot and play many titles. I expect you have a few dozen in your Steam library, right?
This is NOT how mainstream gaming looks. The whole gaming business is focused around a small set of very popular franchises: GTA, TES, Diablo, Warcraft, FIFA, CoD, Battlefield, Assassin's Creed, Tomb Raider, Fallout, The Witcher, Civilization, Gran Turismo - things like that.
Nvidia doesn't need to win all game developers. It's enough to get RTRT support in ~half of the top series. At that point almost every gamer will have at least one game that benefits from this tech - often the one he plays the most.
Next year consoles will start supporting RTRT so this will really become a standard. Nvidia's strategy assumes that RTRT will become a key selling point in GPUs and AMD's first implementation will be rushed and lacking. This will let them dominate sales for another 2-3 years - even if AMD catches up on performance and efficiency (thanks to Arcturus, 7nm EUV or divine intervention).
Where did you get that "50%" from?
CUDA is the standard and it dominates GPGPU. There's basically nothing else. The only reason for people to use OpenCL in scientific / engineering GPGPU is when the program has to run on CPUs as well. And that's fairly rare.
Gamers underestimate CUDAs popularity - likely simply because they have no idea what they're talking about (why would they?).
Ask a scientist. You'll see I'm right.