This is something I did messing around in an attempt to very conservatively guestimate the Marlins 2006 revenue (used old revenue sharing, old ticket prices, etc.). Note the total of revenue before a single ticket is sold - in the $60 million neighborhood. In the past couple years, you can add revenue distributions from MLB.com and now the MLB network. Based on this, my guess is that the Nats probably are presently in the $70 million range of revenue before the first ticket is sold. (I don't know if the links still work - you can cut and paste them if you want to look them up)
Marlins Revenues:
National TV Broadcast Revenue
ESPN (2006 – Due Under New Contract) 273,500,000
Number of Teams 30
Average Per Team 9,116,667
FOX (Contract Expires after 2006)
Total Contract 2,500,000,000
Number of Years 6
Average Per Year 416,666,667
Number of Teams 30
Average Per Team 13,888,889
Total National TV Broadcast Revenue 23,005,556
http://www.azcentral.com/sports/diamondbacks/articles/0915mlbtv0915.html
XM Radio
Contract Value 650,000,000
Number of Years 11
Average Per Year 59,090,909
Number of Teams 30
Average Per Team 1,969,697
Total National Broadcast Revenue 24,975,253
http://www.nydailynews.com/sports/col/story/247916p-212347c.html
Local Media (2001 – 150 TV/Cable Game) 15,353,000
http://www.baseballprospectus.com/article.php?articleid=1297
http://espn.go.com/mlb/s/2001/1205/1290777.html
Total Broadcast Revenue 40,328,253
Revenue Sharing (2003) 21,000,000
http://sports.espn.go.com/mlb/news/story?id=1803537
Total “Before 1st Ticket Sold” Revenue,
excluding Merchandising, etc. 61,328,253
Revenue per ticket (2001 - discounted for give-aways) 13.29
http://www.baseballprospectus.com/article.php?articleid=1294
Attendance (2005 at 2001 Prices) 1,823,388 24,232,827
Total Revenue Before Merchandising, Concessions, etc. 85,561,080
Justification
2003 Revenue (includes post-season) 101,000,000
http://www.forbes.com/free_forbes/2004/0426/066tab_26.html