The entire "physique" culture created in the 1950s and 1960s in the US started with posing straps like these. I was recently at a party in Texas and the hostess had a huge framed graphic (like 72" x 72") on one wall of their pool house and it was a Roy Lichtenstein-esque interpretation of a 1950s muscle magazine cover with two beefy guys flexing in posing straps similar to the one in the link you provided.
To your point, yes, I think there are some guys who wear them. (Otherwise, why would they sell them?) I can't see wearing one myself... but, to each his own.