Paris Saint-Germain is also very successful in terms of player transfers. They have quality young players and are selling many of their academy players to Europe. Now that their team is in near-perfect form, they're not rushing to make transfers. It's also worth noting that they've won the French League championship every year. They generate a significant portion of their broadcasting revenue and are successful in the Champions League. Therefore, I also believe that Paris Saint-Germain's revenues aren't particularly high, nor are they anything to sneeze at.
PSG has handled things so brilliantly in the last few years, they have been consistent in winning the league therefore they have gotten lots of revenue from that but last year saw them get their biggest payout as a club because they just won the champions league and not only that because they won other domestic cups too. They have also started investing in young players and not only old or about to retire players like they used to do before. I think their revenue are high, although they have been spending but they're also selling and this is making their spending to not be that high. They have revenue from other competitions too.