I've often wondered what other people spend too.
Ever since learning I put away NZD350 a month away. My SO calls it the Recreational Savings plan - it was nearly always in the red and I had to fund my other passion (racing mountain bikes) out of it too.
This year I've had to suspend my flying in order to save up for a new mountain bike instead. Worryingly I've not missed flying but that may be in part due to the crappy summer we've had or the attitude of the local aero club and post-PPLs.... but I digress.