The rest of what this poster has said has been debunked but this needs covering:
It might not be core, but they have a basic rule book and then they have stuff released later. A rose by any other name...
do they now. all of them? And that's how they all work?
(people hate when I do the whole Socratic thing because they don't get it. So here's the gist. these games are not like that. Fell free to research them and find out I'm telling the truth)
I'm also assuming correct amount to spend. Since the release now patch later mentality is in full effect, core only anything is never good, so you're looking at the cost of all rulebooks for that system and the time cost to learn them in order to get into it properly. It's just not worth it to maintain more than one meta.
Obviously you are not. So, that happened But I want to cover the "meta" thing.
Now correct me if I'm wrong. But you mean "different types of game" rather than "I don't know what the word meta means". If i am incorrect and you do want multiple games, please explain. otherwise...
That willful grasp at ignorance seems amazing to me because there are many reasons to play multiple games.
First playing multiple games refreshes and energizes you in different ways.
Second, you become a better gamer overall when you play multiple games.
It seems amazing that you would always want to play the same game. Why not have a variety?
Is there a reason for this? No curiosity? Don't like to think? Don't like new experiences?