Two points - your arguement is backwards, he should spend 500m (say 400 stadium and 100 for players to avoid FFP)? Surely spending the 100 is easier for FFP
Secondly, again, why should he plough 500m of his own money in, when he can get others to fund 400m of it?
He's a business man, like most owners these days, not a fan, so he's not going to give away money where he doesn't need to
I'm working on the assumption that the point for him to the club would be to turn it into a top team. That needs money, lots of. But unlike, say, Abrahimovic back when he bought Chelsea, because of the FFP, he can't just hand over hundreds of millions (which those interest free loans basically are) so he needs to figure out some other ways. He also can't, say, buy the naming rights for some ridiculous amount because of the same FFP rules.
So, how do you think he could do it in any reasonable timescale? If Liverpool win the CL final they will make more new fans worldwide than we have in total. The gap is ridiculously large so they will make tons more money from merchandise and sponsorship deals for decades no matter what. Well, if we managed to win the CL five times in the next 20 years we might be in with a shout, but without the possibility of doing a Manchester City the chances are slim.
So would he buy the club and be happy with annual 4-6th place finishes with maybe a Carabao Cup or FA Cup?
And I want to repeat, he would NOT hand over half-a-billion pounds in the stadium case, not in his lifetime at least. He would hand over whatever the club will now pay in interest per year. And he would own the stadium. I would estimate this to be around 20 million pounds per year. Doesn't sound that much, except that it would still increase turnover by more than 10%. It could pay the wages for two world-class players. It's also not-so-insignificant if you consider that we are not going to get anywhere near that from the naming rights (well, it might be possible if USM Holdings buy the rights, could just pass as acceptable by FFP).
Now, if someone really wants to disagree with me, feel free. But please try to come up with actual arguments rather than "you the financial genious" or plain "you are wrong". If you think I'm wrong, please try to figure out why Usmanov would buy the club and whether he would like to make it a powerhouse. And if so, how could he do that if he's not going to put any of his own money in the club.