Amazon affiliate conversion rate?

Just a question for members using Amazon associates, what would you class as a respectable conversion rate for your traffic?

When it's 5 and above I am pretty happy (if the traffic is: organic>>website>>Amazon)
With PPC model (PPC>>website>>Amazon) it MUST be much more (especially if the products are "low price") to ROI well.
Via list , like organic/PPC>>squeeze page >> newsletter >>Amazon = I don't know.
If yo send useless & massive cold traffic, 0.1% is OK too

Part of the deal is not only when you get them to buy from your page, but how likely they are to also buy other stuff when visiting amazon at that point. Differnt to most other affiliate sites the conversion is more a "do I have enough to buy again in my shopping cart". Remember however the cookie time limit.