[CTcard]

2) I can't speak to age group appeal like BC just did, but here's the collective, league-wide season live attendance for the major sports leagues. I did not include any non-American leagues in any sport other than EPL. Second figure is annual TV viewership:

 - MLB, 68.5 mms. (30 teams) - Does not include AAA (13.5 mms.), AA (8.8 mms.), 24 mms.
 - NCAA D1 FBS football, 36.7 mms. (131 teams), 249 mms.
 - NCAA D1 basketball, 28.0 mms. (358 teams), 351 mms. men, 349 mms. women
 - NHL, 22.2 mms. (30 teams), 27.6 mms.
 - NBA, 22.0 mms. (32 teams, never would have guessed that hockey outdrew the NBA collectively), 50.4 mms.
 - NFL, 17.0 mms. (32 teams), 114.4 mms.
 - EPL, 11.1 mms. (20 teams, premier division only)
 - MLS, 8.7 mms. (28 teams) , 29.3 mms.

When one posts numbers like this it is very helpful to have some kind of reference as to where they come from. A link is great, but any reference is good. It helps people interested in the topic in track down more information. 
[Even if the info is from wikipedia, which is my default guess.]

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Live attendance has to factor in the number of teams and the number of games, and the typical size of an arena.  

Has to factor that in for what purpose? 
Obviously those things tend to drive the number in live attendance. 
However, if one is interested in the income from live attendance, however one gets there is mostly immaterial. Baseball salaries remain high largely from those high live attendance numbers, which indeed depend upon things like playing lots of games.

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The attendance and TV numbers do emphasize that baseball is following a different income model than the other sports. Baseball still makes it generally difficult to watch games on TV. Few are available on my live streaming service, and I believe few on cable. Most games I do see listed are blacked out in my area (Connecticut), even if the game is in the midwest - maybe even on the west coast. 
Obviously, baseball seems to have determined that actual live attendance is its income driver. 
For most, its TV viewership.

[CTcard]

2) I can't speak to age group appeal like BC just did, but here's the collective, league-wide season live attendance for the major sports leagues. I did not include any non-American leagues in any sport other than EPL. Second figure is annual TV viewership:

 - MLB, 68.5 mms. (30 teams) - Does not include AAA (13.5 mms.), AA (8.8 mms.), 24 mms.
 - NCAA D1 FBS football, 36.7 mms. (131 teams), 249 mms.
 - NCAA D1 basketball, 28.0 mms. (358 teams), 351 mms. men, 349 mms. women
 - NHL, 22.2 mms. (30 teams), 27.6 mms.
 - NBA, 22.0 mms. (32 teams, never would have guessed that hockey outdrew the NBA collectively), 50.4 mms.
 - NFL, 17.0 mms. (32 teams), 114.4 mms.
 - EPL, 11.1 mms. (20 teams, premier division only)
 - MLS, 8.7 mms. (28 teams) , 29.3 mms.

When one posts numbers like this it is very helpful to have some kind of reference as to where they come from. A link is great, but any reference is good. It helps people interested in the topic in track down more information. 
[Even if the info is from wikipedia, which is my default guess.]

---

Live attendance has to factor in the number of teams and the number of games, and the typical size of an arena.  

Has to factor that in for what purpose? 
Obviously those things tend to drive the number in live attendance. 
However, if one is interested in the income from live attendance, however one gets there is mostly immaterial. Baseball salaries remain high largely from those high live attendance numbers, which indeed depend upon things like playing lots of games.

---------------
The attendance and TV numbers do emphasize that baseball is following a different income model than the other sports. Baseball still makes it generally difficult to watch games on TV. Few are available on my live streaming service, and I believe few on cable. Most games I do see listed are blacked out in my area (Connecticut), even if the game is in the midwest - maybe even on the west coast. 
Obviously, baseball seems to have determined that actual live attendance is its income driver. 
For most, its TV viewership.