I'm in Ireland, and most people have those keys too. But those things are too easy to open with a bump key. For the last 15 years I've insisted on proper secure locks and keys. The most I've ever had to pay to retrofit one is €90 (bought it in town and fitted it myself). I got 5 keys with that lock. My neighbour replaced his too, after I demonstrated a bump key to him.

Having a symmetrical key isn't something that I even cared about but I suppose it's a bonus.