Oren Cass ‘05 has an interesting post about his adventures among the consulting and investment banking firms that hire from Williams. The whole thing is worth a read. I was struck by this passage:

Let’s say you are given a billion dollars and told to invest it however you want. What’s the first thing you would do? Hire an investment banker! When companies find themselves with billions of dollars, they do the same thing.

No! The last thing you should do when that billion dollars magically appears is hire an investment banker. You might as well hire a used car salesman. Now, if you know you need a car, then hiring hiring a used car salesman might make sense. But first you figure out what you want, because any (good) salesman is going to sell you whatever he has.

Most investment banking fees are not made on the purchase side of the transaction. They are made on the sales side. For the most part, I think, it is the seller who pays — just like when you sell a home.