Who says it's worth buying Minecraft?
I bought it myself 5 years ago and now it is lying around in my rule.
Depends on
Minecraft offers variety through Mod / Modpacks and through the server
otherwise it is boring after a while if you do not know about creative building or redstone technology
meanwhile mojang does a bit more the 1.13 and the future 1.14 offer a bit more fun
I think it's not worth it, have gambled it yourself, but quickly got bored, do not know what others think about it.
Can you try it?