You pilots won't be so happy when you are unable to find any crew who can afford to go out for a drink with you.
To be fair, fewer and fewer crew are going out for drinks anyway, with pilots or other cabin crew. Certainly on night stops I usually find myself being the only cabin crew member out with the flight crew as everyone else is "too tired".
I don't think not having cash will make any difference to people's drinking habits.
I did a Singapore recently (yes, a Singapore
) and we had a temp on the crew. £11k basic plus £2.54 (or whatever) and hour. He was out every night for the full duration.
If people want to go for a drink, they will. It's also why Gatwick remains such a sociable fleet despite the low earnings.