Every big club in Europe has grown a lot in the past decade and a half. As a percentage of revenue, all of Bayern, Real, Barcelona, Atletico, Tottenham and Arsenal have grown more than United between 2004-2013, plus, of course, all the sugar daddy clubs. Even Liverpool is only slightly below, only the big Italian clubs are significantly lower on the list. Source:
https://www.google.pt/url?sa=t&sour...FjABegQICRAB&usg=AOvVaw2GzpdEG0GY-5VAjonqARKg
Obviously it's safe to say that without the Glazers you would grow anyway, and on a comparable ammount, unless an abnormal cataclysm had happened. The whole of the industry grew in that time.
Why 2004-2013 instead of 2005 (when they bought United) - 2018 (they are still the owners).
Considering this time: United's revenue is 2.61 times as big big as it was (417m more). Real's revenue is 2.86 times as high as it was (438m more). Barca's revenue is 3.83 times as high as it was (478m more), Chelsea's is 1.87 times as high as it was (211m more), Bayern's is 3.6 times (422m more), Juventus' is 1.88 times (191m more), Liverpool's is 3 times (284m more), Arsenal's is 2.8 times (314m more).
A few times to consider though:
- Percentage is probably not a good measure. Going from 1m to 2m is 100% growth, but is it more impressive than a 50% growth from 100m to 150m? I guess it isn't.
- United's revenue is slightly lower than it should be cause of UCL money (we got qualified via Europa and didn't get a shitload of money that clubs who get qualified are given). With those money, the difference will be higher than Madrid's and Bayern's.
- United has not been successful in the last few years, so this takes a hit. Compare it to Madrid who won 4 out of the last 5 UCL.
- The trends need to be considered. United was almost getting overtaken by Chelsea as England's richest club, now we are by far the richest English club. *
TLDR: Only Barcelona has done better than United when it comes to financial growth (Barca arguably wasn't even considered an elite club until last decade, and now they are easily a top 3, if not top 2 club). This despite that we have been pretty shit (cause of a series of bad management choices and not having a long term vision). The fact that we are actually on pair with Real while we are in the worst period in the last 3 decades, while they have had arguably their greatest ever spell is a testament on how well (financial wise) United is run.
Would this have happened under different owners? Possibly, it depends who those owners were. Under the previous ownership is very dubious considering that their 'have Nike and vodafone as sponsors and that's it' philosophy wasn't going to work on the new era. Obviously, they would have adapted to some degree, but it is extremely likely that United wouldn't have had this aggressive growth that we had.
* From 2002 to 2005 United's revenue increased for 42m. On the next 3 years it increased for 56m. On comparison, from 2002 to 2005, Chelsea's revenue increased for 99m, on the next 3 years it increased for 66m. On other words, United was stagnating while Chelsea (cause of Roman's investment) was gaining territory. United needed to increase much faster in order to continue being England's top club, and that was what happened in the next 3 years when we started to make some of the 'noodle deals'. Of course, the longer under this regime we were, the larger the gap between us and the other English clubs become, and the trend is continuing.
Comparisons with clubs from other leagues are a bit more difficult to be made (especially in the past when revenues were smaller) cause some variable totally out of owners control (like new TV deal or Calcioppoli) skew them a lot.