For a firm to buy a tiny lot could, IMO, only be to put it on their own internal radar. It’s something they have to look at/review/monitor/explain monthly/quarterly, whatever. It’s an ante into the hand as a way of not forgetting about it. The dollar value means nothing more than a place holder. Not an endorsement, but a reminder to keep on this. Again, only my opinion, but no other reason I can think of makes sense than to place a marker.