I'm perfectly OK with it turning out like that. Some people lose their minds if they don't get that promotion, or raise. I'm not one of those people. My life outside of work, and my well-being are a shit ton more important than that.
Sure, I'll probably never be a millionaire. But, the only life I get won't be spent at work, either.
Two years ago I was career-centric. I worked from 5am to 10pm almost every night. I wanted that promotion. Got it. Life was terrible, lead to everything falling apart outside of work. I'm still dealing with the aftermath- overgrown yard, home/car maintenance, health, etc. Wasn't worth it. Stupid me, I even took the promotion without a pay raise.
That's why for Ironsnake, I'm recommending weighing it out and testing the waters by pushing a set limit of responsibilities. If the employer is good about that, I say full steam ahead. If they aren't, I'd question the motive.