So here's an interesting get-rich-quick sort of scheme that some of you might be amused by.
Back in August, faced with the more or less insurmountable problem of figuring out where the valuable moons were in an entire region, Marlona Sky hit upon a brilliant strategy. Instead of scanning every single moon around every single planet in every single system, his alternate solution was to only scan moons that had moon harvesting arrays nearby. The logic was simple and devastating: with so many sov-holding alliances treating moons as a valuable asset, he figured that someone, somewhere, had already learned where all the valuable moons were. Any moon that had a moon harvesting array was probably something worth investigating; any moon that didn't have one probably wasn't.
The only downside to his strategy is that he had to go and fly out into space to learn where the moon harvesting arrays were. That's a lot of work.
Suppose you're sitting on a nice big pile of Mobile Siphons. Where are the best places to put them? Well, it turns out that you can follow a variation on Marlona's strategy and you don't even have to undock (too much) to do it. If a Mobile Siphon gets killed in a system, particularly if there's a POS on the kill-mail, you can pretty well assume that there's a moon worth siphoning in that system.
It even turns out that Mobile Siphons are something that you can search for individually. Here are -- at the moment I'm writing this -- 169 Mobile Siphon kills.
It's safe to say that there's a POS in each of those systems with something worth siphoning. You can even pull up individual kill-mails and learn what the siphons were eating. Here's a system with a technetium moon. Here's a system with a neodymium moon. Here's a system with a dysprosium moon. You'll still have to go to that system and hunt around a bit for the right POS, of course. But 17 times out of 20, I'll bet if you find the POS with the right corp that killed the previous siphon and the POS has a moon harvesting array, that's the one you're looking for.