Seem to be getting a weird error, it doesn't let me post says 'unspecified error' and then shows an additional reply to whoever I'm quoting - so if it multiposts this, please delete the duplicates :L
As Kahi/Jon has now clarified, unfortunately this wouldn't work. Would have been great if it did though.
This rule as stated by Eljay, seems to encourage the combination of both an image and text in a singular post. As you mention later its idea is to defer people from just posting a meme without contributing to discussion, that i understand - just a deterrent wont have an effect if the rules regarding the image posting are unclear and i feel the level of relevant text may need to be decided so that people can contribute.
As said by myself and others, your boards, your choices and things. Very few people have issue with the rule, if any, its just the phrasing and unclear nature of the rule that seem to be causing confusion.
As you mentioned, you determine what is spam - so what level of relevancy or how many words determine if a meme with a bit of text above is breaking the rule is unclear to the general user - and they ideally need to have a general idea so they can follow the rule effectivel.
Its just by bringing up the amusement angle it added a factor that didn't seem connected to the rule, by not mentioning it, things would likely have passed smoothly with this just being viewed as a mild addition to one of the previously established rules about not posting solely images or aspects that don't contribute to discussion (The rule that closed topics such as the CTRL+V topic)
Ah ok, didn't realise that was how it works. I suppose it makes sense with preserving aspects, though can see why memes and things would not be worth storing. Odd that it also happens with aspects hosted on other sites and posted to the boards.
Can see why this sort of deterrent is necessary now, though admittedly it will only be effective if it is not only followed, but also convinces members not to upload images as much - which unfortunately is going to be difficult considering that fans are trying to keep themes like Bionicle alive by doing MOC's or artwork, which while they are the intended thing to store on the boards, are becoming more popular meaning more images.