My reaction is probably pure 'stick in the mud' -- but while, IMO, a rare appearance of an image-macro would undoubtedly be amusing (assuming an 'amusing combo of image and thought), overuse would quickly make tedious even the cleverest. Consider, for a very rough parallel, were we to label every submit button 'stumbit.'
And the lower the level at which a junior member of this enterprise is empowered to insert an image-macro, the less PM experience (IOW, greater tolerance for the images) that individual would have.
.o0 Perhaps use of an image-macro should be limited to janitors... as a device for them to reinforce -- when their services are required -- the Monastery's guidance on how and what to post.
Update: spelling/typo, s/ever/every, fixed, thanks to moritz and s/reqired/required/, thanks to : caffeine ? heightened sensitivity; likewise thanks to moritz.