It's very prevalent in this industry. Newbies cost less and there is usually a lot of mundane work that needs doing, so they comprise the majority of any average team. Even more so in established or mid-size companies where the sudden expansion or huge existing base necessitates a lot of grunt work. Sadly, there is also a trend of managers bending over backwards to please newbies (otherwise the hiring pipeline is thought to dry up; also, it's easier to hand out raises that appear larger if pay is lower) which exacerbates the situation.