I haven't been to Turkey, so I don't know how the culture evolved there. However, in former Ottoman-controlled states that I've been to (and especially in Romania, where I was born and live), tipping (as well as small bribes, which are both called bacșiș here, same word as bakshish, though that is changing somewhat recently) is quite prevalent and expected in many settings. At the very least, in any setting where you are served by someone while sitting down, even if it's just drinks at a bar, you are expected to tip (typically 10% being seen as a tip for cases where you were happy with the service).

Tip jars are perhaps a more recent phenomenon, but they are now almost ubiquitous in all places that serve anything, event at a counter or to go - including club bars, coffee shops, even many fast food places.