indeed.

And to extrapolate a larger point -
If you are a dedicated enough racer to train a bunch, (espcially stage racers where you've got a small number of dates circled on your calendar), I'd advise going through the points of basic failure - defined as, "can't race because of this part's failure", and carry spares.
Between racing and working in a shop that a ton of racers went to, I've got plenty of stories of someone who trained for 5 months and then couldn't race, or had to try to scrounge up a bike to borrow and all the ensuing stress.
On "Hida's List of Things" (a non-complete list):
BOA cable/Laces
Cleats
Spare RD Hanger

Slightly more expensive things (more of a stage-race focus): never know what may or may not be available after a Sat night crit for Sunday am RR start
Spare chain
Pedals
Saddle (get a used whatever is currently on your bike)
Rear Derailleur

Beyond this, there's lots of stuff - any mechanical item can & will be a point of failure - and I'm not advocating carrying spare handlebars to crits. But, having a plan and trying to cover the most basic stuff that tends to not live through crashes (such as say, carbon railed saddles?) is a pretty decent scheme for people who have a limited amount of time to play lycra-pants-hero. There have been plenty of times in my live where I didn't have an extra 4-5 hours in a week to make multiple LBS visits, scour the internet for spare parts, and then get it all installed before the next workout/race day.

Crashes happen. Fact.
If your bike uses a wonky RD hanger and you don't already have one, ordering can easily take a couple days to get it - and you'll be off the bike. No backup bike? No training.
If your shoe buckle/cable/cleats are destroyed in a crash - it's much easier to have a spare on hand, and likely cheaper than scrambling to buy whatever you can get the most expediently in the moment.
Oh, and add some tegaderm to your order - if you need more than one or two of the things on this list, you just might need some of that as well.

It'll take any reasonable person 15' to get almost everything on that list rounded up (aka ordered from online or phone in to your LBS), and once you get all the stuff, another 10' to put it in your race bag and carry it around with you.
Presto, peace of mind if you go down in a crash-
You will save money because you can go w/ the best price around, and you'll need all those items over the next year or so anyway- wear and tear most likely - but if stuff gets sideways, you'll be back up and running in no time at all - with no stress of sourcing parts.

oh - and if you rely on your local shop folks to do repairs for you, occasionally hooking them up means that when service quues are crazy over the summer, they may be more likely to get up you and running sooner instead of later.

No - I'm not an obsessive over-preparer, but I've never not started a race because of gear failure - even after getting my stuff smashed up.
cc: tetonrider / RacerEX - thoughts on gear prep for races?