Yeah, heard of samples? Jkjk I get what your saying tho. We are all wrong here but I do come to mangago as well to explore and see different titles. When I see a manga/manwha/webtoon that I like, I find a copy from the author and go buy it(if it's in my language). I'm not speaking for anyone else, just myself. I know you didn't ask but just wanted to share.
Lezhin already gives you a sample: the first chapter is free. What the OP is implying (and what you are doing, I’m assuming, since you replied) is that after getting the sample of a whole chocolate cake, it’s alright to dig into it, eat two or three pieces, before deciding you like it and buy the rest. That makes no sense.
I usually come to mangago first to decide if I like something and explore new titles. I have supported many artists because of this site.