Personally I don't like nor trust this casino. However, in this case on your own admission Palace of Chance had comp'd you the wrong amount.
Instead of contacting support you state "instead of the $14.27 that I thought I was due, my account was credited $1427.
I decided to go ahead and play, realizing that at some point the casino would probably deduct the $1412.73 that they had inadvertantly credited to my account."
I'm sure you were not playing minimum bets or should I say what you would have played if they Palace of Chance had comp'd the correct money of $14.27.
Why now should the casino allow you to keep these winnings.
From my experience based on reputable casinos, contacting support and making them aware of their error, has in most times been a favourable thing on my part. Most times I've received a little extra for my honesty.
In your case you knew it was wrong but you commenced play anyway. What were you thinking!
Now you post here stating a foul and it's not fair!
If on the other hand you had fessed up and contacted support
before commencing play you may not have received a thank you reward, but, you may have actual won something legitimately. If thenyou didn't get paid, then posting here would be a suitable recourse.