I'm not anywhere near the passionate wrestling fan that I used to be, so I can't be bothered investing anytime into anyone but WWE nowadays. I invest in them because I at least know that there will always be something they do that's enjoyable, hence why they've been around so long.
I always was a bigger fan of them than anyone else anyway because I personally feel most of the best feuds and promos and matches have happened under the WWE banner. I also like a combination of gimmicks/storylines with a great in-ring product (like others) and they provide that. I don't like a raw wrestling product like ROH. I even tried watching Survivor Series 1988 not long ago (which was much more of just long match after long match after long match than what you see today) and I found it incredibly boring after a few matches. The WWF product could beat you over the head with sometimes nothing but matches and not much else back then in the 80's, too. Just look at some of their cards before the first Wrestlemania, like The Brawl To End It All and The War To Settle The Score and their monthly MGS cards.
I tried to get into TNA by watching a few episodes of Impact, but there was little that interested me. I'm also very hesitant to spend any time investing into a non-WWE product after the way WCW let me down back in the day. To summarize, they went from being the show that got me hooked to wrestling in the first place to being just two and a half years later the show I wished would die out already just so it would be put out of it's misery. With WWE, they have a rich history and I know they're gonna be around for a long, long time (as long as Vince is alive surely, the future after that is still uncertain.)
Another thing is that there's only so much time in the day. I like to do other things other than just watch wrestling lol. I spend so much of my time as it is just re-watching old WWF/E and WCW stuff to refresh my memory of things long forgotten over the years that I don't really have the time to dedicate myself to investing deeply into other wrestling products.
Another thing, and some may consider this condescending, but while I can enjoy things (movies, TV shows, video games, etc.) that are not among the most popular, I find it hard to get into a wrestling product that has such a limited number of people there in attendance. Not to mention the cheap looking production value. It just makes it look too small time for me personally. (It doesn't have to look too "Hollywood" like the way all the WWE shows do now either, of course.)
: been looking for someone else who dabbles in Lucha, what did you think to Terrible vs Rush?