I've been lurking a bit, just reading about investing in bankrolls to make a return on coin. I couldn't find any hard numbers anywhere on average returns per website, other than anecdotes from posts. Are there any official charts somewhere that show average profit/loss for the major sites?
for official charts you have to visit the gambling site itself and look around to see if they are offering that or not (if i remember it right moneypot offers such charts)
but for solid numbers you can check out this topic :
https://bitcointalk.org/index.php?topic=1585408.0it contains 5 of most popular gambling sites and started had invested 1
BTC in each of them
this is after 2 months:

check the topic for more discussion.
this looks good, thanks for the link.
but the charts doesn't indicate which gambling site's status are these, or is it a total of all?never mind, there is a legend on the right that i didn't see before lol