Why is that?
With all due respect, if you are still unaware of just how difficult they can be, then more research is needed. Not meant as a put down, but rather trying to save you an expensive learning moment.
Simply put, they need massive enclosures and massive filtration systems. Ammonia and nitrite HAVE to be ZERO at all times. Water has to be kept perfect with ZERO slip ups.
If you can master perfect chemistry with no fluctuations and feed them the foods they have to be fed in the massive quantities they require without it touching your water quality, then they are easy.
However, keeping parameters in check is a lot easier said than done. My system changes about 230 gallons of water a day, and I have a huge sump running 4500GPH and I still do water changes every few days