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Maybe decrease of overall income. Or Bitvest decided to decrease forum promotional budget and move funds to other, more needed, sector.
Also I have noticed, that 777Coin Signature Campaign also got reward reduction in the beginning of August, but their rewards were cut more.
Anyway, Bitvest is still a very generous campaign, compared to others gambling signature campaigns.
That's a bit sad but I guess we can't do much about it and just move on, the prices are going up anyways so I don't think that we are going to lose that much when it goes up and it stabilizes in terms of prices.