Profits from promotion, cup success, player sales (Wilson, Clarke etc). Not just Maddison.
Well at this point we simply don't know if it is profit or increased turnover that has or will be be spent.
I do agree with you that the club is on a better financial footing than it was and is much better run.
It took SISU about 10 years to steady the ship, the first few years were not very clever.
I still do not understand why SISU bought the club in the first place, any fool with half an eye on football finance should have understood it would take £100m or more to get from the Championship to the Premier League short of a fluke promotion (like Blackpool a few years back).
I also do not understand what motive SISU have for staying, the only possibility is that they think they can hang on till Wasps are desperate and force a deal on them which recovers their investments since Joy took charge. (I see SISU investment in 2 distinct parts the failed and written off original led by Ranson & successors and the ARVO investment c. 2011 to present).