Looks like a joke. They've been constantly reducing their rates though. They are starting to pull a full-yobit.
Reasoning out about the price fluctuation, well it's their campaign though.
New campaign has launched just for hero/legendary members.
PlayBetr Signature Campaign | Hero/Legendary | $50/Week in BTCPayouts & Positions:
10x Hero/Legendary Members - $50 in BTC/Week.