I've worked on several of Yahoo's campaigns and can say this. I've seen Yahoo try and coach people to not just post the bare minimum required for the time period for the simple fact some of your posts may be deleted.
I do know that most campaign managers look at the number of posts after your initial post for gaining entry into the campaign, not just your post count total.
As for your future, if you want to earn money; great nothing wrong with that but you need to put in the effort of being able to put in a quality post. If you are just replying with the same generic crap that everyone else already has then the odds are that thread is doomed for the trash bin.
If you manage to gain knowledge on any subject to a great enough degree ( wallets/exchanges/ mining/ trading) then you can usually look around and find a way to contribute to the discussion in a meaningful way. This is truly the only way you will continue to earn by doing Sig campaigns. This will help you get Merit and increase your rank to the next pay tier.
But... you were paid the full amount you should have? What exactly are you complaining about? Yahoo should be counting based on time, and not starting post count, so if your older posts were deleted, it shouldn't matter. Also, how is this a Meta issue? I don't see how complaining/being annoyed about mods doing their job is a bad thing. The actual lesson should be: If you're in a campaign, please don't post just for money, it's okay if you don't get paid.
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Seeing this though I feel that OP may fall in to the category of people not reading everything or doing their due diligence before posting. I wonder how you missed seeing the payment received as you yourself stated this is a good amount of money in your country.