actually it has been reduced, but as that was already the case for the 24hours, there are some over time, something like 4hours (don't ask... I am new here lol). Also as I have noticed before the end, you'll lose about 25% of the actual post value.
Not sure though why yours went down to 3 dollars... yeah may-be because someone noticed, the original author wasn't you ;) (I personally would be pretty pissed off, if someone was posting the content I was intending to post before me... lol)