it's a passive takeover, we see it all the time in business, think of it like the buy-to-let schemes.
- buy business
- ensure it doesn't go down in value (i.e signing Koeman/Walsh and buying players with funds from player sales, all to make sure we stay in the Prem)
- add value to business with a perma-upgrade (renovation or more likely new stadium with 15k more seats, increase per-seat cost to demonstrate increased revenue)
- sit back 2-3 years then sell stake at a sizeable profit.
In theory it's a low-effort (hence the motley crew are kept on) yet high-gain business tactic, but it's no banker for it's reliant on the Prem boom continuing. Still relatively low-risk.