I am not surprised that an overwhelming majority of us are responding that lower ranked members are not discriminated against. All of us who have reached a high rank before went through the lower ranks. Even recently there have been very notable cases like n0nce or PowerGlove, who gained merit as lower ranked members at an impressive pace.
So less protesting and more working, OP.
Just saw this through the mention. I agree: everyone was super kind and welcoming and appreciated my posts when I first signed up here. But I did and still do put a lot of time and sometimes money (purchasing hardware wallets for review, server costs for the yearly altcoin portfolio competition, ...) into my posts.
It's clear to me from the very title of this thread that your posts very likely just aren't 'good quality'. Especially since you specifically created this thread to complain about not getting the reactions you expect for your 'good posts'. It all starts with spelling errors & grammar, which make some people's contributions just very hard to read, and ends with lack of self-reflection, critical thinking and common sense, which would answer the very question you're asking here.
Ultimately, I'd wager to say that the merit system does exactly what it's supposed to here, unless I'm shown high-quality posts and threads that went under the radar. We even have members specifically offering to help in this regard, like fillippone here:
[Merit] Share your best posts/threads with Fillippone to be merit assessed