What is your idea of worth?
It is only a couple hp:
http://www.nissanperformancemag.com/august04/specv/
For me it is something to consider, not only for the slight hp gains but also to prevent the water pump from cavitation. However, I probably would only see .1-.2 secs off of lap times. Where as new tires would get 1.5-2 secs of lap times. So comparatively it is not worth it.
Personally I’d do the tires first, suspension next (struts, springs, bushings, swaybars) , then brakes (pad, fluid, lines), then breathing (intake, header, exhaust), then clutch (something mild like “stage II or III”) maybe a flywheel, and then towards the bottom of the list pulleys.
They mark up everything, then you call them and act all buddy like thay are giving you a deal. In reality they charge maybe 2-5% more than a cheaper source.