Off course it matters. Suppose you use to play with 0.01 (like I did) with the price almost doubled i've changed my habit to place 0.005 Bets. I am confident i am not the only one.
The same thing doesn't work vice versa, at least for me. When the price was 220 dollar, I was still making 0.01 BTC. not increasing, since I've learn to feel confident with
But like you say, the gambling behaviour seems to have changed, at least on bitcointalk. Where it used to be dice, now sports betting is the thing to do. Not wrong if you have some big events next to each other: Ronald Garros, Wimbledon, EURO 2016 and off course the Copa America.
This is the truth. In the past, when btc is less than $100, people came in to gamble with btc. There is even people who bet with hundred of btc at one shot. However, now when the price of btc has shot up, the bets that people are betting in most casino are now in mbtc, and most people dont bet with 1btc anymore.