Bands DJ-ing at clubs

Specifically, when you get flyers and things for clubnights that say the band on them, but then that its a DJ set, implying that this is somehow a good thing and worth my money. I dont understand why anyone would think i would i want to go and see people from a band i like with an almost 100% certainty that i wont hear any of their songs. I really dont care what some two bit indie scenester has on his ipod. Its not like you've even got any assurance that they can dj well! I dont know if it's just me but i'd rather stay at home with a nice cup of tea and some Jerome K Jerome than pay to see the bassist (its never someone worthwhile is it?) pretend they can mix. If they were just going to play hot anthems that you'd expect at a club anyway then why would a promoter pay them to do what a faceless man in tight jeans does every night? Everyone knows that venues or promoters only get bands to dj because its a way of getting idiot scenesters in at a fraction of the cost. Waste of money.
To be fair, i can see the point if you are a tiny, tiny niche clubnight like New Noise or something, when booking someone from a suitably large band might be charming (if it is still cheap to get in), but for the amount of dj sets that go on at, say a twice yearly Adventures In The Beetroot Field night at Fabric or Turnmills or somewhere, then for gods sake, cut some of this mindless drivel off the bill and use the money to get British Sea Power or No Age or Dan Deacon or someone i want to watch. Please. Then maybe i could get home before six in the morning (getting home later than 4 am is a rant in its own right), what with the utter inexplicableness of early morning night bus timings in central london!