Manchester United is the only mega club in England, the reason why they can do massive deals is because of their organically developed commercial prowess. They're ahead of everyone in England.
Chelsea are similar to Arsenal in terms of finances and commercial deals the only difference is our business practices when it comes to playing assets. Chelsea have adopted a far more pragmatic practices compared to Arsenal's idealism under Wenger.
We have money, we just need to manage our assets better. ie more players sales to generate money for better players and a reorganised wage structure.