Despite the brazenness of their enterprise — some install themselves in full view of uniformed police and yellow-clad security detail — ballpark bootleg merch vendors are a cagey lot.

Insider T-shirts and hats for long-ago films—including those that didn’t have merch to begin with—are never-hotter thanks to bootleg sites.

Surprise, surprise — Metallica are once again getting litigious against folks trying to make a buck off of their name. Their touring merch company, Merch Traffic, just filed a lawsuit in St. Louis ...