You can't determine a site's worth just by the number of visits it gets in a month, there is other criteria that must be considered as well.
Traffic / Page Rank / Existing Income / Domain Name / Domain Type / Age / Niche / Content quality (original or copied) / Content amount Provide those and we can start to consider value.
A good way to measure the quality of your site is by checking out your page strength and comparing it to sites where prices you know.
As much as someone is willing to buy it for, finding the right buyer with motivation can then blow away any valuation models that people will try and throw at you.
it depends on income also is that 2.5k traffic is stable? buyers will see traffic stats for atleast 6 months or so