That's pretty much what I said. If I haven't yet purchased skins that I've had 9 years to purchase I don't see why giving me 30% off will make me want to purchase them.
Whether you think rusty blitzcrank or prestige irelia are ugly, that's up to you, but everyone's going to find some of them ugly, hence the "You don't already own those (specific ones) for a reason".
Perhaps the reason was price, in which case, maybe 30% is all it takes for you to now want to purchase it.
I'm not being pedantic here, that's legitimately why consoles try to get their price as low as possible late into their life-cycle; maybe you WERE always interested, just not $400 interested. Maybe you're $150 interested, though?
Sometimes a discount is all you needed.