Firstly, newbies do not understand all neccesary regulations, thus may easily get hurt when their posts are deleted due to not conforming to rules.
To put it simply, your posts are getting deleted because it's useless or irrelevant. Simple as that.
Secondly, newcomers are seen and sometimes treated as strangers who trying to get some precious resources from the cummunity.
You don't even need to have an account to read topics and gain information. What are you talking about?
Thirdly, posts by juniors are probably not appreciated and usually passed by senior members (i.e. newbies writing just for other newbies reading, mostly).
It's simply because most junior members and newbies don't know shit and are here only for the bounties and nothing else. The only people that are complaining
"sr members arent noticing our posts bla bla" are the ones who are complaining only because their posts are not good enough for merits.