I would be remiss if I didn't say that I got more this month but also wagered more this month as well, so I am not sure what to make of that, maybe next month I will get the same amount or not, I will give it a try and wager as much as last month to see if there were any changes and notify people here as well. On the other hand, its free money and I have never considered making a scene about free money made any sense at all.
I understand that you might have been given it so far, but that is just a way stake thanked you, and if they are giving less now, that's mainly because they have more people to give and inactive ones were the first ones to go because of that, they have to pay active ones first without making a loss.