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there is no easy answer. depends on where it's placed, how prominent it is, and how much traffic/benifit they are going to get out of it.
i can't see they'll get much, if any, if your site is brand new with a PR of one. maybe they are thinking long term benifit.
But this, of course, is only a rule of the thumb - you see links for sale for much less and much more; on average, the rate I gave is rather high and you won't sell many links with it.
[edited by: encyclo at 2:01 pm (utc) on July 23, 2008]