How does one tolerate incompetent colleagues?

So I like my job, I like the boss (quite a bit of mutual respect), I like his second (again respect) in command.

But the other staff are... let me just say they're worth the minimum wage & absolutely not a cent more. They are disorganized, spend more time yakking than doing their job and the seniors shift off whatever work they can to new hires, etc. They can't even handle basic phone calls at times not asking specific questions to find out what exactly a customer is after.

I've another unionized job that pays me more suitably to my experience & am doing this job more as a sort of out of favor to the boss (anyone else I'd have long since walked off) who definitely needs a competent staff member to assist him (with his business picking up).
How does one tolerate incompetent colleagues?
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