I use ignore a lot, and there are two main reasons for being added to my list.
Merit abuse - this includes begging, buying or selling or exchanging with alts. I believe that a willingness to do any of these things indicates moral weakness, and I don't want to award such people. I am having a bit of a rethink about this, as sites like Steemit encourage the purchase of upvotes, and new members coming from another forum may not realise the community policy regarding merits. However, there really isn't any reason to avoid reading the rules and guidelines, and the forum is overrun with posts about merit at the moment.
Making posts that slow down reading - This is a personal choice, and it may not reflect board policy. I don't read posts that are long and heavily formatted, and I may put the poster on ignore. Creating great slaps of unbroken text are hard to read, and so is posting in capital letters. Rambling text in unintelligible English gets ignored, as do posts with large embedded graphics that add nothing to the post. Quoting a long post immediately close to the original post gets skipped. There are some other things like plagiarism and using Google translate, but I expect you guys get the idea,
Reading posts, and awarding merits is subjective, so I sometimes put abusive posters on ignore.
Can you read my ignore list? No, but you can see my merit abusers gallery at -
https://bitcoinscammer.com/bitcoin-beggars/ . I moved it onto my Bitcoin scammer site, and at sometime in the future I will add to that site.
Can you appeal? In theory yes, but if I have you on ignore, then I don't know how you can do this.
Can I see your posts? Not as Jet Cash, and that is the account with all the merits to award. Talk Merit ( my alt to handle merit discussions ) doesn't have anybody on ignore, but it has a negligible number of merits to award. So if I see a post as Talk Merit that I might award, I have to switch to Jet Cash to make the award. If its on ignore with that account, then it won't get the award.
All of this may sound hard, but there is a major problem with spammer infestations here. I loved Bitcoin Talk as it was a few years ago, and I want to help to revive it. If you can't be bothered to read the rules and obey them, or if you have a low code of morality, then I hope that the new merit system will drive you out to find other swamps as we drain this one.