[WS:] Well, that is just one place and time and, I may add, a very peculiar time in which investment bankers are unquestionable kings. You may well be correct in saying that investment bankers are both, capitalists and organic intellectuals. That may hold for certain high profile businessmen as well.
But that has not always been the case. If we follow argument proposed by Max Weber (_Protestant ethics_) the role of ideology changes quite significantly in the life time of a political system - it is quite essential in the initial stages, but it gets quite spurious after that system gains hegemony.
In the broader time frame (the past 100 or so years,) the role of "organic intellectuals" which includes not just academics but even more importantly political parties - in shaping class interest and their relations to public policy has been demonstrated quite convincingly by social historians like Evans, Rueschemeyer, Skocpol, Heclo, Stepan, or Timbereger. The latter is particularly worth mentioning here because she demonstrates cases of state and military bureaucrats actively taking on entrenching class interests to build a better capitalist economy (Japan, Turkey, Egypt and Peru.)
I would also like to mention in this context those intellectuals who are not normally not thought off as propagandists of the capitalist system but whose work nonetheless feeds into the maintenance of the capitalist system.
Obvious examples may include management gurus, marketing researchers and policy analysts, less obvious ones - psychologists, criminologists, engineers or educators. The latter is especially worth mentioning because of their adoption of "business model" for education, which is not explicitly intended to propagandize capitalism, but which nonetheless legitimates it.
To reiterate, I am not arguing that this is a one way street i.e. intellectuals defining class politics, but rather - as one sociologists aptly observed - that intellectuals have much more class power than they think, but not as much as they would like to have. Ignoring their role in the maintenance of the capitalist system is a serious intellectual error in my opinion.
Wojtek