I would go an extra step beyond Iogi. You can learn more from smart people, but you can also teach them far easier and more enjoyably. They also often get more out of it. Being able to finally be with someone who can understand what you're talking about can be a great relief even if and sometimes especially if you're not learning anything at the moment. This does also have the side benefit of impressing them and/or helping you gain high status, so the two can get intermingled.

There's also the fact that they also usually want to talk a lot, especially if you give them food for thought, so you have to go a long way before you risk monopolizing the conversation.