Getting 8th should hurt. A LOT.
Shit I'd even say take away the demotion cushion. Your MMR should be your MMR. period. Enough of this hidden BS.
I don't know or care what your rank is and I'm not going to look at it or assume anything, so for the sake of argument lets say you peaked at Gold 1, then started losing.
You probably spiked real hard off a bunch of wins -- then wins started meaning less and less (because they should reasonably have diminishing returns? Idk its a rito thing -- ask them)
In the game, because its stupid, you've been blazing through ranks and divisions. Iron, Bronze, Silver, Gold -- one after the other. Nothing can stop you.
But in actual MMR land, where shit actually makes sense and matters -- you've only been climbing a little bit. But this is hidden from you, because Riot is stupid.
So realistically you're actually probably only like high silver, mid low gold MMR.
So now we're back in rito land where the game is for some reason telling you you're Gold 1, but in MMR land, you're only mid silver. Because of the huge discrepancy, you lose a SHIT TON of LP because the stupid game's stupid system is always trying to get you to equilibrium of where your MMR actually is behind the scenes. If you win a bunch, it'll drag you down. If you lose a bunch, it'll help you out.
All of this said -- hypothetically you'll go on a pretty nasty losing streak now. You're matched against players that are higher than your skill. Probably MUCH higher than your skill. Gotta knock you down a few pegs back towards players you actually belong with.
But wait, there's more!
Because of the discrepancy in MMR and Rank, the game will actually OVERCOMPENSATE in trying to get your two different-for-some-goddamn-reason ratings, and will now start putting you against players you absolutely crush. We're gonna swing the pendulum the entire other goddamn direction.
Sweet, omg, I'm gaining LP again! I've gotten better! I'm good at this game! Look at me smashing EVERYONE!
And because of the stupid ass ranked/MMR system discrepancy, you get catapulted right past the rank you're supposed to be AGAIN and end up mismatched AGAIN.
And you'd THINK that after a little while, the momentum would cancel itself out, and you end up nice and comfy cozy where you're supposed to be, and all the outliers and weird streaks and trends go away, and you pretty much stay consistent from that point forward -- which is what would normally statistically happen in a functioning, normal system.
But that's boring. Its much more interesting and much more addicting and much more profitable to keep the players on this nice pendulum effect, so that when they're high -- they're real high. Give them the illusion that they're making progress -- they're fighting the good fight! But when they're low, they never feel like they're gonna be up again. We're chasing dragons here. Like a bunch of damn junkies.
Welcome to ranked the Riot way.