That's crazy they sell apparently decent 11x11 cubes these days.
I remember back when I was getting into cubing, late 07-early 08 and you could only get up to 5x5 cubes. Vcube had a website up for what seemed like forever (I was 10 so it may not be as long as my memory tells me) showing that they were going to be selling 6x6 and 7x7 cubes, and at some point it started feeling like vaporware and I thought maybe the site was just a viral stunt. But eventually they came out and I bought a 7x7 which I still have, and I thought it was so cool. It's still the biggest cube I have but it's not great to use because it was before a lot of modern cube tech advancements.
I'm not super hardcore into cubes, every few years I look online into what the zeitgeist is saying to find the best new 3x3 speedcube and buy one to keep on my desk and do E-perms while reading or watching videos. And a couple years ago I bought a decent 5x5 (looking at the email receipt, it's - YJ MGC Magnetic 5x5 - Stickerless) and I've had a lot of fun playing with that sometimes while listening to podcasts. Though it is prone to pieces popping if I'm not careful with my turns