Another explanation I've heard for Aesop buying literally anything (one that I prefer less than my own personal canon mentioned above) that I think is probably more likely the intent of the card:
Aesop, for his own personal reasons, has an interest in funding runners and bringing down corporations. He wants to fund you. Selling him something, anything, is just so he has something to put in his ledger so he isn't as transparently just funneling you cash for your cybercrimes.
I can even imagine him rolling his eyes a bit when you tell him that today you are selling him "motivation", but he's still up for giving you the money, figuring he can spin that some way.
That said, I prefer to think he's lonely and likes talking about his arm.