That is completely true. It only gets worse the longer you stay in one group. After 20 years of doing 1 little piece of a giant puzzle (of which there is only one and there are no competitors), can you really go anywhere else and be anything other than entry level? And how do you give up $120k for $60k as an entry level guy elsewhere even though after 20 years you should be making $180k.

It is a giant trap for those that aren't aware of it from day 1.