Because if the rule is revoked the unwashed, day-old hordes that currently descend en mass on defenceless profiles at the merest whiff of possible possession of pixel-pussy will instead return their attention to the threads themselves, circling the once-proud carcass of fallen discussion like a pack of hyenas.
Cackling and hooting cries, often in broken English, will sound out across the lands as the ulmfverse is cloaked in the oppressive mist of sub-decem-post profiles once more. 'Link for game now give', 'HHHHHHHHHAAAAAAAAAIIIIIIII, game LINK PLS FoR ME NYYYYYYYYYYYYYAAAAN!', 'Sir give please the sprite bob sir, the virtual vagina sir, much needed sir'...
Threads filled with posters, unable to even (or bother to) read the last two posts before them, falling over themselves to repeat the same requests ad nauseum, the metaphorical cannons of the mods unable to repel the surging cavalry charge of the uncaring entitled, an unrelenting tide of low-class beggars dissatisfied with the morsels already given out for free.
Vagrants the lot of them! If the tables were reversed, and it was they instead that possessed said patreon-payposts and dlsite-debauchery, would they bother to share it with the rest? Nay! Instead they beat a quick retreat to their fetid and festering hidey-holes, the self-absorbed hourly brutalising of the bratwurst their sole concern.
So yeah, unfortunately that's pretty much it.