[omernev]

I hope I'm understanding the question correctly. If I don't answer fully, go ahead and comment again...

Mostly, the answer is that the algorithm doesn't need tweaking between different sites. It's even a bit more generic than that: It mostly needs possible actions to take (in our case - products it can show), information sources (in our case - indications of interest), and a goal function to maximize (in our case - something like revenue).

We're playing around a bit with slightly different weights to different verticals - but definitely now for specific stores.