Kitted up

I have a few days cycling in France starting on Friday.  Not that this is very noteworthy, but this trip has highlighted a few things that I am finding difficult to 'control', specifically my aim to take a bike in excellent condition and the quality of the components thereon.  I have replaced the chain, tyres and brake pads, and I have successfully resisted the temptation to install a new rear mech.  I am only going for 5 days, so why am I spending money/time swapping kit I probably don't need to?