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Unfortunately it did. Before I could atleast get 0.01 now I get 0.00. What's up with that?

I think I read somewhere that they adjust it based on how much you post per week.

They base your upvote on a weekly value. They have a set sp per share per week.

So you vote is devided by however many posts you normally do per week. So if you increase your post rate you decrease your persentage upvote per post. Speading your weekly upvote more thinly.
There are three ways to increase your upvote from SBI.

  1. Buy more shares
  2. Post less frequently (unless you are in pool 7 or 8)
  3. Upvote all @steembasicincome posts to get up to100% bonus shares.

My original bracket was actually @sbi2 but because I've posted 2 to 3 article a day I was downgraded to @sbi3 a few months back. And now I was directly downgraded to @sbi5 and not @sbi4 just because I start posting 2 article a day, again. Are you saying that if I keep posting 2 article a day I would be eventually downgraded to @sbi6 or @sbi7? Is that how your system work?

Its not my system but you have a set amount of sp per share. So if your upvoted from any pool the value would be the same.
The reason they put you in lower pools is to make sure you are getting a good persentage and not a dust vote.
In the higher pools you could drop below 1% and steemauto doesn't accept a persentage lower than that, so they put you in a lower pool. This brings your persentage back up again.

But if you start posting to the point that even @SBI6 is below 1% you will go into @SBI7 or @SBI8. In these pools you only get one upvote a day. This helps to keep those who post a ot from going below 1% upvote.

The main thing is what ever pool you are in your ROI is the same based on a weekly upvote value

If you were getting 0.01 upvotes at your posting frequency, then your upvotes were actually too high, and that's why you were moved. Your estimated WEEKLY value is 0.02 per share (with upvoting bonuses).

As pools grow, members that are not keeping up may be moved into lower pools. This is one reason the lower pools are now rate limited (one or two upvotes per day, depending on the pool).