cf Marvel's Mysterio, Batman Beyond's Spellbinder and the like...
Heroes tend to be a little brighter about it, cf Buddy Baker's career as a stuntman and Gar Logan's career being every talking animal in live action movies (It's cheaper to get him to do the role, then computer colour him afterweards than it is to CGI the animal talking), though Peter Parker not marketing his web fluid has been much discussed.