Not a bother
@noproblem , Kus is famous for being way, way, way, overpriced and practically EVERYTHING is fake. While I also find the natives very friendly they will happily take 5,000TL for an item that is worth 50TL.
I have been going there for quite some time and have befriended a few locals. I also hire a car each time and have gone to some of the outlying villages and towns, which is an eye-opener to just how expensive Kusadasi and other tourist spots like Bodrum/Marmaris etc. really are. These resorts are all 'currency priced' and do not reflect the real value to be had elsewhere.
The minimum wage in Turkey is ~2,800TL a month ie. ~ €280.
So in Kus. at say a street cafe, a fillet steak meal with all the trimmings is around 120TL, sound good at €12. But would you pay over 17% of your min wage weeks pay for a roadside cafe steak meal here?
Go out of town and see what 120TL would get you, I'm not joking when I say a family of four would eat and drink well for it. But I reckon you know that already.
I never bring anything but Euros with me, and get as good if not better rates than doing so with banks,
I have never found the need to bring hard cash with me, especially now with 'Revolut' which, so far,
has always given me better rates than any bank or change outlet and not just in Turkey. I buy TL on my Revolut card, so that gives me a TL account/balance and draw down on that as needed. I only withdraw TL from ATMs, for incidentals and say going somewhere rural etc.
While I have never felt threatened in Turkey, I still do not like carrying hard cash.