I reckon the casual fan is only interested in hearing the song being played and seeing the main man. After all he is "the voice and guitar of Dire Straits," now where have I heard that before! I really don't think that casual fans, and that's the majority, are that interested in the rest of the band.
Interesting comment dmg, because i find the opposite is true.
I count myself as a 'Hardcore' DS/MK fan of over 30 years, and of course Mark is the reason 99% of people (including me) go to his concerts etc...
But for me, i'd happily go and see a band if one of the ex members, or someone who has collaborated with Mark is playing, even though Mark is not.
I have seen John Illsley with Chris White in his band in London a couple of times.
Also i have been to see Dennis Locorriere (from Dr Hook) just because Pick Withers was in his band.
Pick was also the drummer in a band recently called Gary Fletchers Blues band, who i went to see, again, only because Pick was there.
Although the excitement levels wern't quite as high as seeing Mark, it was still great to hear his style of drumming, and tieing it in with the early DS sound.
A few years back, i saw George Michael with my wife. Now this wasn't because i like George Michael. ( Give me some credit)
But because Danny Cummings was on percussion, and Phil Palmer was on guitar.
I even got tickets to see Jimmy Nail. Not only because Mark performed on the 'Big River' song, but because Marcus Cliffe from the Notting Hillbillies was playing bass.
For me, seeing anyone who has been importantly connected with Mark is a great thrill.
Cheers BBB