I've now had to replace the following in 36k and less than 4 years on our 2004 A4
2 x tail light
At least with DIS I know immediately when a bulb has gone.
In the 3 and a half years and 54k in our Bora I didn't have a single bulb blow despite doing far more commuting and night time driving.
I've never had a bulb go in any other car during 20 years of driving.
In 7 years with my VFR I've had 3 headlight bulbs go and that's it. My Bandit 1200 had a headlight go and my XJ600 had one tail light.
So, do Audis eat bulbs?