Another kick in the proverbial nuts

And now the Rival Employer has just upped their offer. Holy shit. I'll be making almost 30 bucks an hour on the weekends. And 3 bucks more per hour base rate.
I told myself I wasn't going to bail out on the job I already accepted. It's a wonderful job at a wonderful facility, just not a wonderful paycheck. But I don't know if I can justify going with a job that is not only not on the shift I want, but offering way less money. All because I was too hasty and accepted the first offer that met my minimum requirement.
And in burning them, I'm going to feel like the world's biggest asshole.