Theres lots of points I'd like to address above:

1) MMA shows are packed because there are only a hanful of big shows a year. MT fans are spoiled for choice as there is a quality show almost every week. I bet a lot more money is spent by MT fans in total buying tickets each year than MMA its just diluted by the number of shows.

2) MT scoring isnt so difficult to understand. You do score the first two rounds its just that usually in a well matched fight the fighters are fresh and close in ability so neither will take too many risks and therefore the rounds are more often than not even. A lot of the reason for drawn first rounds is not the judging but the fighters tactics. If a fighter totally dominates the first round or scores a knock-down he/she will win it.
The early rounds are used by the fighter to find and expose weaknesses and to "soften up" the opponent so that they can capitalise later on.
If you win more rounds you win the fight. Full stop.
But as there are only 5 rounds to decide the fight, if the first two rounds are close, the fight is decided on the last 3.

3) Boxing scoring is no easier and there is just as much controversy about big fights in boxing when they are close. Most fights in MT or Boxing are pretty clear whether you are a purist or Joe Public.