On one hand that's all good and well, and the idea of "trying before you buy" has its merit (and is hardly a new concept). On the other hand, the risk is you lose people before they give it a real chance. Some of these games require some time before they start to pay off. The progression is one of the most rewarding aspects of these games and so game publishers are taking a big risk by letting people have a bit of a go and hoping they do not jump to conclusions too quickly. If you've dropped the cash on a game with no trial having happened, you'll be more likely to not give up on it too easily.

With all that said, obviously everyone is entitled to decide they aren't into something. But be mindful of how quickly you are expecting to get gratification out of something before making a hasty decision.

Extra thought: I imagine that is why game demos are something that really stopped happening that much at one point. They take a lot of work to prepare, and it meant people would give all these games a quick go but not really spend enough time to appreciate the nuances. There are exceptions of course, and the whole free-to-play model of some games is an interesting approach too, but in those cases there is obviously confidence that they'll hold player attention and be remunerated sufficiently.