There are quite a few tricks you can pull with this card.
-You can use the recurring credits to trash assets that you access in HQ, or on PSI games. -You can use the recurring credits to pay to remove Tags from siphon or vamp with NACH during the Run. -You can absolutely Vamp people using these credits.
Finally, the somewhat odd nature of this card regarding virus counters and recurring credits needs to be clarified: At the start of the turn after the corp purges virus counters, the recurring credits stored on pheromones from the previous turn are not removed.
I feel like I finally made decent progress with this card when I built a Gabe deck using Cyberfeeder, NACH, Vamp, Siphon, Central Breakers, Djinn, and Lamprey. Every card in here is good in Gabe already except Djinn, which can totally tutor out lampreys or host your sneakdoor.