Chet is not a star or superstar, they're banking in him becoming one especially since he missed an entire season. I think they could've waited especially with the amount of team who actually have money.
He is not going to, not in this setting, remember Chris Bosh..... He was a borderline All Star, glorified super role player next to Wade and Bron Bron. The realistic and ideal path for a 3rd option is to play elite Defense and provide 19/20 ppg which does not disrupt chemistry and upset both the 1st and 2nd Option.
What I just said, the third guy always gets the short end of the stick.....and mostly bigs .....but they are more than compensated in money. Like a 3rd Wheel. The Sixers rather have Embiid as their 1st Option which did not yield much Success.
I don't think the money is the most important part but the years, if he gets injured or sucks, they can cut ties easily with fewer years. Big men are getting paid in this league regardless. But yeah I like him so I would not have had any problems paying him.....