It's a good question to ask why figure skating competition is so hard? I never thought about it before. Yes, most other sports, popular sports, have competitions once a week or more during high season. Why figure skating is so hard with just 6 GP, one national, one world, and every four year the Olympic?
That makes me think that maybe because figure skating is totally different than the other sports such as tennis. It is very complexed with combination of sports, art, and performance.
First of all, the less availability of ice. You have to have ice to practice, while many other sports you can practice in school, in community center, even on your driveway, and the designated place to practice like tennis court are in much more abundance than ice rinks. (our local rink gives more and better time to public session which elite skaters can't practice, or to hockey).
Second, unlike other sports, like Ant and other posts pointed, you have quite a long time window to make up for mistakes, while one minor mistake in the SP or LP can tank a skater.
Third, in that small time window for SP and LP, a skater has to not only showcase their athletism in the form of jumps, spins, speed, but also their appreciation of the music through subtle moves, body movements, transition moments with the music, which requires great focus and energy to cover. That's also why when a skater has perfect clean jumps at practice when he/she jumps alone may deliver a UR jump during a competition program.
One more thing I can think of, there are so many elements skaters have to practice. 6 different jumps, many differents combinations of spins. If it takes 3000 times of practice to perfect one technique, it will be much more achievable to execute 3000 great serve than to land 3000 clean 3Lz. And on top of that, you have to woven all these different technical elements into the context of the music in 3-4 minutes.
All of these and even more (I am sure there are more that I didn't mention here) make figure skating a hard sport. But with less competition, the sport gets even less audience, which translates into less $$$, which makes the sport even harder in the way that it's very difficult for a skater to succeed.
This is my longest post. I am definitely not an expert of the sport, but just a fan of the sport. This is what I think, hopefully it makes sense to some experts here
