I can assure you that the "shitposters" very much care if someone replies to one of their posts. The reason they care is because if you reply to their posts, they can respond to what you said for another easy/quick post.
Then, I would have gotten much more replies.
I think there may be a couple of reasons you received so few replies:
1 - you posted in fairly large threads in which it is difficult to even a "normal" person to find a response to what you say. These "shitposters" want to spend as little time writing each post as possible, and going back multiple pages to look for a response takes time. I suspect you would get different results if you replied to these users in a smaller thread.
Maybe, but I had the impression that also smaller threads start to get more pages very soon if you can't get a first page reply.
Most threads do not get that many pages of replies.
In my experience, most threads that are titled with a question, especially those that can be answered "yes or no" will not have a lot of meaningful discussion. Looking at the other threads you (I assume 0xmiau is you) posted in, I am not especially surprised you didn't receive a response.
2 - There is a 20 post per day limit as to how many posts each account will be paid for. I don't think many in this campaign will make much more than 20 per day, or even look at the forum from that account once they make 20 posts that day. If you wait a day or two, you may see a couple more responses
My experiment took place way before the YoShit Signature Campaign (April 11 + April 12) and is not related to it. It migh be a strange coincidence that YoBit starts their spam campaign just after I started to do the experiment.
And I've waited 10 days for their replies if you look at the date of my posts in the OP...
Ahh, that is my bad -- I only assumed this was related to the yobit spammers because that is what most threads are about right now.
I looked more closely at the posts you replied to, and they are especially bad.
My experience with shitposters more closely resembles what happened
here by "brewins". I have seen other signature spammers act similarly in that they would ask a series of questions in a marketplace thread for something they had not interest in.
I had always assumed most signature spammers have at least a
very basic understanding of bitcoin, but this is perhaps not true (anymore). Ever since I saw
this thread, I have suspected some of the bounty hunter spammers are being paid by a third party, and the same forum account may not even be used by the same spammer from day to day. If someone does not even have a basic understanding of bitcoin/crypto currencies, they are not going to be able to engage in a conversation with you -- if they try they will look (more) stupid.