Because somebody has to create that media. And that person they have to live. (Or better that huge team when it comes to movies) So they have to earn money, so somebody has to pay them.
I also enjoy that today I can test if something fits me If I am skeptical. But I also always make sure to pay back creators for things I enjoy so that in the future there will be more things I enjoy.
Of course I understand anybody who can not afford media and am happy to subsidize them with the part I am paying for good shows. But if you have a Plex server, you can afford it. And If you say its close just start with things you like most and at least say “thank you” to them.
With very little initial work, physical media is also very convenient.
I buy a disk, put it into a specific drive, get a instant message when its ripped, check its name and put it into a folder. From there my mediabox converts it to a managable size and adds it to the collection.
Whin I turn on my TV I see all these Movies and shows neatly presented by Kodi. I have a tiny Wireless keyboard and can start any in under a second. No buffering, no adds, no matter if the router is connected, and no fear of ever loosing access.
Its great.
Exeptions are there of couse, I would love to buy The Orville, but they just don’t want my money!