We spend 8 mill less that CP because we sold allot, but we spend like 450 millions in 5 years time, only city spend more. We get money from loans and tons of players sold, thats why we have good +--/. Comparing net and money spend is bad idea, because some clubs spens alot (MU, City) but doesn't sell.
Roman got his vision which is Chelsea playing some attacking football, and youth comming through. He destroyed everything when he hired Mourinho, he did because he failed with Pep who is his manager. Roman always wanted Chelsea to play some attacking football, club brought sooooooo many youn, attacking player wich few of them are Lukaku, KDB, Hazard, Oscar, Bertrand and so on.But when he hired Mou he destroyed every Roman dream, we just payed for title with our future.
I hope that our new manager gonna be Pep, he always plays some crazy looking football, plays tons of youth, and is every football player dream to play for him. Just look at Douglas Costa who went to Bayern only to play for Pep.