How far do you wear your daily shoes out before bothering to replace them?

These are my daily walkers, BMX riders, rainy day shoes, and mechanic work shoes. Left shoe not pictured, but I'm sure you get the idea..

Yes I do have a few much nicer pairs of shoes for nice or important occasions, but I'd rather fully wear out one pair of shoes at a time.

So, what's your worn out shoes looking like?