I'm old enough to remember the times when Everton were the big spenders, shopping for players in the best places on the high street. Then, through various failings, bad luck and bad management, we were suddenly headed for skid row, had to sell the family jewels and ended up scratching around skips picking up garbage in the hope we could polish it up and sell it on, just to survive another season. Basically, our credit was worthless, and we were precariously close to falling off the cliff.
Now, Moshiri comes along, and though we may not be back to the point of "shopping at Harrods", at least we are shopping again. The players we have let go have either not wanted to play for us, or have been deemed not good enough. It is too soon to tell if their replacements are better, or if the transfer money is well spent. The point is, our credit is better now. We have, this window, regained a little more respect in the transfer business. This has to be down to Moshiri, because I do not for a moment see this happening under the old order.
As to the question in the thread title, I think his "investment" so far is more about boosting our aforementioned credit standing, steadying the ship, bringing financial confidence and attracting other investors, (especially with regard to getting the stadium built). He is a master accountant, and therefore will do this without ever spending a penny of his own personal wealth, (wish I was even half that clever with my cash).
Everyone needs to stop thinking of him as some kind of sugar daddy, with infinite cash to throw at us. We are not (yet) owned by a money laundering oligarch, so put that idea away. Moshiri is here to run Everton as the business it has to be, in order to survive in this crazy money driven league. In my book, that makes him a major step up from a theatre owner and if that is the sum of his investment so far, then it is worth it.