Maybe there are just more backpackers during our summer looking for some quick cash.
Most shops have given up on backpacking Caucasians simply because they are generally unreliable and either show up late or not at all.
In the last few months I've noticed new Czech, English girls who were on the roster for the following day but were off the roster by 12pm the next day. Turns out they just never showed up.
Too difficult for shops to manage especially when they have to call eager punters up to cancel their bookings.