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I've got a site with something similar in the home page title tag and there are not problems at all getting that site to rank on fairly competitive terms.  Whether it would rank better without that is hard to say.  Ours changes only once or twice a week though, although I don't imagine that makes a difference. However, it has helped our click through rates - which means more traffic.  Traffic is the aim, so I'm happy with that. My only concern would be whether it impacts bounce rate.  If the thing being counted is a key part of the decision and people click through and see something different (because the cached version is out of date) that might have an effect.  Pretty easy to measure that though.