I LOVE playing the Sunday Million, don't get to play it enough. I actually bought in once straight up but it's out of my BR management range so I don't expect I'll do it again soon. I will play sattelites and shootouts to try and get in though, I've managed to get into the Sunday Million several times and have cashed in that tourney about 5 times. From 300 to I think around 1400.
What's difficult about this tournament is the blind structure and the amount of players you have to contend with. 20 minute blinds means you have to catch cards and flops against good players, you can read some player styles and play the player but more often than not this is a card dependant tournament.
Card dependancy isn't total, I'm just stressing that it's a larger factor than usual for a tournament. Good players = using all your skills, cards, position and tactics/strategy.
There are indeed many CC players good enough for the Sunday Million, but of course staying within bankroll management is very important. With 3 to 6 thousand players even the pro's are hard pressed to get to the final table. The Sunday Million is kind of like a mini WSOP
every week, it takes luck and skill, with 20 minute blinds luck is a huge factor, if it's meant to be it will happen, if not then enjoy the ride, it's a great game.