I think our revenues are similar enough (will obviously fluctuations with CL football etc) and we've got 200 million or whatever of cash that most clubs don't so in terms of affording to spend I don't think there's any reason they could do it more than us.
Basically the point is they have Willian, Costa, Hazard, Kante, Pedro and we have 200 million in a bank account. We could have easily swapped some of that 200 million for some of those players (or similar) and have a squad comparable with theirs but we refuse to, so we can't claim they're doing well anymore because of money and then by extension claim that we're not because of inability to spend it.
To establish themselves as a big club, sure that was bent and annoying and it probably punished us more than most at the time but from here I can't see much they're doing wrong compared to us. If we'd paid 30-35m for Hazard, Kante, Costa, Luiz over the last 4 years and spent similar on Mustafi, Xhaka, Ozil, Sanchez and won the league nobody would say we bought it. Every player at big clubs these days is 30 million.
I can understand it's a big shift in mentality from how we've been in the last decade but from my perspective we could have got Conte, we could've got players at Chelsea's level and we could be celebrating a 90 point season which is why I can't be fucked with Wenger's bullshit anymore.