I wouldn't count on it, kinda like when I use Sedo compared to other parking companies the traffic estimate is always like double of other companies as some companies have stronger bot blocking to filter out artificial traffic where others just let it all flow in on the statistics. Base your decision on the domain name itself and search volume shown with google adwords keyword tool etc... and don't take the number literally as you may find the true unique visitors are lower after purchase. Look the domain name up and see if it's indexed and has backlinks in google from relevant sources and archive so you can gauge where the traffic is coming from.