That £300M is from player sales + tv cash (£50M more per annum than when he arrived here).
Heres the thing though Dave, IF his ambition was just milking the club, then he'd be spending just what is required to stay afloat in the league
Like him or not, he hasn't done that by a long shot, or to put a perspective on it, Say West Ham sold a player for 75-90m - you reckon we'd see them spunking 150+ m on players in that season, not a chance in hell they would do. Same goes for Newcastle and the other clubs where the owners have shown that without doubt they are after lining their pockets first and foremost.
Moshiri could be here for 6-7 years and then move on after making a good profit after the stadium is built etc mate, but thats 6-7 years of having to put up with fans moaning in every media outlet that gives them a voice, on every social media platform, having to fend off questions from the media and negative articles, all for the sake of a few hundred million (lets call it 500m at a stretch) in profit after those seven years.
He made that much and more by buying up shares in Facebook early doors and then offloading them when they went through the roof about 4 years later, and all he had to do was sit there watching the price rise until the correct time to cash in and make the profit.
No hassle, no exposure, little risk as he knew the field, and easy money, why on earth would he go into this club to make a similar profit which will be the hardest grindiest profit he's ever made in his life, and having to deal with the utter mess the club is and all the problems that come from that? and even at the end of it, if he does cut and run he will be lumped in with chancers like Ashley and the dildo brothers, wreck his reputation, all for a profit he can and has made with little fuss in the past.
Really doesn't make any sense mate, this is for him a vanity project, IF he has the actual money to succeed and does he have the backing of Usmanov will determine that success, combined with if he is learning from his mistakes before it's too late for him and us (which are joined for now)