Listen, you obviously know nothing about PSG and the sponsorship deals they have, why are you trying to pretend that you do? PSG was slapped (and rightfully so) by UEFA for our huge QTA contract, we had to find another main sponsor (it is now Accor). PSG now has minor deals with companies from Qatar and it was reported that they amounted to roughly 30M in 2020.
PSG's deals are overvalued, you just said it yourself. And the industry knows that too. Your brands, outside of a couple, aren't paying the same fees you see in the PL. The PL is the most financially viable football league in the world, period.
Sponsorship deals help a club, but PSG's expenditures for wages and transfer related fees cannot be paid for simply by finding another commercial deal in a matter of days, especially as it relates to Messi.
Ligue 1 has such a poor domestic TV deal that doesn't provide revenue for clubs down the table. That is a matter of fact.
The long of it is this...PSG doesn't have the clear sources of revenue at an elite level like PL teams do. Namely partnership dollars and domestic TV revenue. Plus one full year without matchday revenue across all comps. And only a handful of teams can spend impressive amounts, at least 30M+...but not like Neymar, Mbappe, and now Messi.
Neymar was a Nike athlete when that happened, I think same with Mbappe, so you can totally see Nike stumping up more cash for their transfers. Messi is an adidas athlete and Nike won't pay to help fund an adidas athlete and not be able to promote Messi as he's signed by the rival apparel company.