Because of their size?
Because of their subject?
Because they have been written at unsuitable time?
What do you think?
What do you guess?
What is your suggestion?
Style, size and subject matter.
I'm of the opinion that style matters. The corrections received by somebody who writes 20 example sentences focusing on one particular aspect of grammar are going to contain a lot more practical value than those received by somebody who has tried to provide a blow-by-blow account of their weekend antics. The former tends to be right or wrong with very little wriggle room, whereas in the latter, subjectivity reigns supreme.
For me, correcting a novel-sized notebook entry isn't fun, and it's even less fun when you know your corrections aren't going to help the person all that much, if at all. I have no problems correcting a generous paragraph, but the chances of me correcting anything any longer than that are slim to none. If you have a lengthy piece of text you'd like corrected, I suggest splitting it up into smaller, more manageable paragraphs. If you do this, I can almost guarantee the number and the quality of the corrections you receive are going to increase. Fun-Fact: Nobody likes slogging through a wall of text with no end in sight.
I don't correct religious notebook entries. I don't really know why, either. Something in my gut says not to, so I don't. Nor do I correct technical notebook entries riddled with jargon. If someone writes a notebook entry about brain surgery or the atmoshperic pressures on Mars, I'm just not going to correct it, because I don't want to have to consult a dictionary every two seconds to acquaint myself with vocabulary I'm never going to use again in my life.
I think it is because there are a lot of notebook entries! There are more entries than people who have time to correct them!
Keep the entry very short.
If it doesn't get corrected, try putting PART of it as a question on the Answers page. It will have to be very short though, or people will tell you to put it back on the Discussion page !
I don't have a lot of time to correct notes, and when I do I prefer to correct notes in topics I'm interested in. Unfortunately there are just too many notes to be able to answer them all.
Khosro, I do enjoy correcting longer notes, including academic notes, but when students don't even do a spell check and make lots of silly mistakes (not you, just in general) then I lose interest. I think most teachers hate correcting basic errors. Sadly, many students write a note, don't check it, and then post it and expect us to correct it.
All of the teachers I've spoken to get annoyed that we get messages every day from students asking us to look at their notes, and we see the same mistakes every time. It's not fair to you, but it does affect our motivation.
Too easy or too personal perhaps not a popular topic to many people I surmise and cannot know, but it is a good question.
If you want notebook corrections, you should use the language partner search function to acquire followers. Most people are too busy to just correct random notebooks. You will have more success if you have followers who you help and who you can write to when you want your notebook reviewed.