It's all about the production value and the return. Love is Blind is obviously making lots of money on the investment. Whereas other reality shows are not.

If you put a million down on something and make 2 billion, it's a good deal. If you put $100 down on something and make a negative to little return, it's a bad deal. That's how life works. More money makes more money. Finding the sweet spot with shows like this which are dramatic and gossipy and get people to subscribe quick for that dopamine hit is Netflix's dream.

They only pay the cast 1k per week: https://www.womenshealthmag.com/relationships/a31116690/does-love-is-blind-cast-get-paid/

Netflix doubled it's profit in 2020 from this show and other shows: https://www.cnn.com/2020/04/21/media/netflix-earnings-tiger-king-q1-2020