Well to me, being my other hobby is costuming, its cool and awful at the same time. I absolutely HATE the power rangers, and that kills it for me. On another note, if its a fun one time tongue in cheek thing, i have no issue with it, except that its a power ranger of all things lol.
I actually have a pro level Scoutrooper/Bikerscout costume from Star Wars Return of the Jedi and wanted to take a few shots on the bike wearing it doing some simple stuff cuz movement in the suit isnt good enough for anything to nuts, but that at least has the "bike" connection, and would be a fun one time photo shoot kinda thing.
As far as promoting flatland in this way, i wouldnt like it at all..its really about the riding not costumes..pretty sure thats why we all dropped the riding leathers lol
All that said..as part of a stage show like that, its interesting, and entertaining, so its not ALL bad....they did it in Cirque du Soleil as well at one point, so sometimes it works...at the very least hopefully they are at least getting paid for it!