I don't get impression that Men's
Health is trying to sell anything other than more issues, because each one is filled with pure "this will get you sex" nonsense. Most if their recommendations conflict with other ones they give--even within the same issue.
Their recommendations based on obscure studies are hilariously bad.
Any type of publication like this gets the majority of their revenue from advertising, the only reason they want more subscribers is because then they can charge advertisers more money because they have xx amount of subscribers. This is why many mags give out free or dirt cheap subscriptions, if they show that they have 10 million annual subscribers they can charge advertisers based on that high number of subscriptions, it doesn't matter that those subscribers paid $3.99 for the annual subscription.
If you don't think that makes anything they publish slightly biased then you're their demographic.