Why don't investment banks have consulting arms?

Admittedly - I just started watching House of Lies, where some bank tried to buy a consulting firm.

So why don't investment banks have consulting arms? Or acquire a consulting firm? Or even have in-house consulting groups? The best I can think of is Big 4 which has some MM investment banking operations, and performance advisory services.

I'm guessing it's because the consulting firm would then not be able to offer advice to a lot of its clients (who may be competitors?)

I'm not very lucid right now so I'm sorry if this is a stupid question.

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They do have it. It is known as M&A advisory

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