It depends how you are working things:
If you are directing links from say ppc straight to pages on a merchant site you can set the SID or EPI to identify which ppc ad but take the ads to the same landing page on the merchant site - so if you had two Adwords ads you could set the epi in ad one to say 'ad1' and the epi in ad two to say 'ad2'
If you are using links from your own webpages then you can again set the epi to whatever you want for the link between your webpage and the merchant (and have as many links as you want landing on the same merchant page)
What epi and sid wont do though is let you have multiple ads running to multiple pages on your own website and track them - you'll need to develop your own method of tracking those - epi and sid only come into play once you click through to the merchant via the network.
Hope that makes sense.
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