The wages don't always increase.  There are wage freezes years long, sometimes more than a decade.  In fact, in the last 20 years we've had our salary rates frozen more years than we've had pay increases (i.e. ANYTHING above 0%).  

Also, when the wages are increasing, they don't increase anywhere near what they do in the private sector.  My spouse got a private sector raise of over 10% last year.  Mine was 1% (less than inflation).  

I'm not complaining about my situation, but please get your facts right if you're going to criticize workers in the public service.