From my experience, people tend to gamble less when the price is going through a volatile stage, this is regardless of whether it's going down or up. I guess this is because people are already engaging in high risk activity so conventional gambling on top of that is not needed.
When the price is stable for a long period of time it seems as that is the point where people decide to throw some coins on the line.
This does make good sense, but I did notice when I did gamble I really dont know how much im gambling, so in that case I tend to alot more then I notice cause im not keeping track of price on mtbc.
I try to not think about how much it is that I'm gambling, back when I was having a good winning streak on PD and gained over 8 bitcoins, obviously I knew how much they were worth, but when I'm in the zone I try to just think in numbers of rolls and bets. Winning against the house is what drives me forward, at the end of the day, if I come out on top, I do a rational decision to put away some btc that I have won so I won't play it.
I have to say though, dice-games are the best when it comes to gambling, you won't find it anywhere else where you can gamble with 1% house edge and legitimately have a chance to win.