Sorry but i don't have understand, the problem of webmasters don't add a prove to cold wallet is only for investor or also for players?
Both of them are in risk because if a site could not provide a solvency proof then there is a chance that the site might turn out to be a scam site. That is why most gambling site provide their cold address to prove solvency, so that people could play there without worrying about their withdrawal not getting through