[TGB!]

The positions arent desireable because theres very little social stratification assigned to the positions themselves, and what kind of mobility do they offer? Not a whole lot sadly - since they are positions that grease the wheels of society - so to speak.

Positions where people can control who has access to what (doctors, lawyers, politicians) - these are high strat jobs because even though you may have the technical skills to do it - someone still has to say "you cut the mustard".