If the Thunder didnt trade Green or Harden they wouldnt have gotten any value in return for them because they wouldn't have been able to sign them anyway.
See, this is where I just flat out disagree. They absolutely would have been able to re-sign them both (although in Green's case it was more a matter of fit than money). There are no rules that prevent it. Just a cheapskate owner. Boo hoo, you have to pay a little lux tax for a few seasons while your core players are in their prime years. Win a few titles, and whatever year-to-year operating losses are incurred will easily be made back in franchise valuation (the money would probably be made back even without the titles-see Sacramento Kings). It's a narrow-minded approach to team ownership, if you ask me.
They would go bankrupt.
Yeah, I seriously doubt their billionaire owner is going to go bankrupt over a few seasons of lux tax payments. He's got the bankroll to afford it. But, like most sports owners, they just don't care to spend any of their own money, and instead treat their teams like your standard business. Always looking out for the bottom line. A good owner, in my opinion, wouldn't worry abut a few seasons of financial losses, pay the lux tax from their own pocket, and possibly collect a few trophies in the process.
As a sports franchise owner, if you aren't willing to do so, you shouldn't be an owner.