I am also interested in this. What's the daily/weekly/monthly POS payout per say 1000 DCR?
From what I understand, it's quite a bit different that regular POS systems.
"Staking in Decred works in a similar way to a lottery, you purchase tickets with the available DCR coins you have or the amount you want to use. Ticket price started at 2 DCR and it changes based on users staking, though it is currently pretty high priced at about 14 DCR, so you might want to carefully choose the timing when to purchase tickets. Then you need wait for your ticket to be randomly chosen to validate a block or to be taken out of the lottery in 142 days if you do not win anything. The coins you use for staking (purchasing tickets for the lottery) will be locked until they are either chosen and you get your staking reward or 142 days pass . According to the information available the lottery lasts about 28 days average and the chance of a ticket not being selected in 142 days are less than 1%, but since it is all luck based your results may vary."
http://cryptomining-blog.com/tag/decred-pos/