I think as with most things, people run their sites the way they see fit and people will submit or not.
If you want the traffic then still submit. You get traffic even if small and you dont get pr, but if you dont submit then you still dont get pr and you lose any traffic you would have gotten. Your only gaining if you still submit, not losing anything extra from submitting that not submitting would fix, if that makes sense.
Now, if they are doing traded links supposedly for pr and using it nofollow it is different. If they just do regular traffic trades or listings without pr in mind then thats at their discretion imo. Category or main page PR trades with someone secretly using nofollow is very different than sending traffic to someone using nofollow and possibly getting a link back.
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