Same over here, 10,000 PIV and made ~105 PIV staking in one month, so I think these numbers are correct.
That's a ~$200 reward in one month, not bad

I'm running my PIVX client on my VPS, together with other wallets and a Waves Node.
Makes me wonder why staking seem to be rewarded more frequently than expected.
I run my wallets on 2 small N3700 PC's located in my meter cupboard, drawing together about 15W.
They are on separate IP's, I only need some extra PIV to get 2 master-nodes running.