"According to the NRMA, the average large car costs about $275 a week to maintain over a five-year period, assuming you drive about 15,000 kilometres a year." from SMH
This bike will start paying for itself after only 3 and a bit years. So it's affordable.
I'd like to say it'd be worth it, if I was rich. Instead I'd have a room full of bikes: 1 x folder, 1 x cyclocross, 1 x light roadie, 1 x recumbent and 1 x slow upright vintage, leaving about $35,000 in savings.
You forgot the value factor, whereby the value of n+1 is raised to a power of 1+y where y is greater than any subsequent increase in income achieved since you reached n bikes in tthe first place - in other words your next bike is more expensive than the last, and also more than you can afford.