Seems like I'm having similar problems. Done four trackdays over two and a half years, all at Oulton. I'll try and keep it brief;
No. 1, early '09, Novice day - Goodridge lines and Catrol Super Response, standard pads and discs (probably the originals as well). Front pads about 50% worn afterwards, front discs ok.
No. 2, late '09, Renaultsport day - everything left the same. Afterwards front pads about 80% worn, front discs looking nearer the end of their life.
Late '09 early '10 Pagid Blue and Brembo Max fitted. For day-to-day driving felt good, didn't need to be worked hard, rumble from grooves in discs really irritating, and pads squealed a fair bit, not much dust though.
No. 3, Goldtrack day earlier this year, pads and discs still in good condition after a year or so of just road use. Out on track lots of racecars, found it difficult to do proper warm up and cool down laps. And a lack of self control lead me to stay out for 30/35 mins a few times rather than my preferred 20 mins. Afterwards - discs ok, pads knackered, high level of wear and cracks in the friction material. Apparently they'd have been ok for road use, but not another trackday.
Anyway, new fluid (ATE Super Blue), DS2500's and plain cut Brembo HC's (fed up of the weird noise/feel of the Max's), and new rear pads.
No. 4, Novice day, week last Thursday (figured a sessioned day would help me to preserve my brakes.....turned out it was open pitlane.....). As previously, I stayed out longer than I probably should have done a few times, but did proper warm up and cool down laps so figured it'd be ok. Had another session with an instructor (always do), mentioned my concerns about knackering the brakes. He said I could maybe brake lighter and longer, but was hesitant to say so as I had good pace and he didn't want to take anything away from that. Last few sessions had really bad wobble/vibration through steering wheel, even taking it easier heading into the bends didn't seem to help much. They feel much better now, but still slight wobble, pretty sure I've warped one/both of my discs. Also, DS2500's seem to produce a lot more dust than the Pagid Blue's I had.
Should also add, the car has not been stripped in anyway, has standard cup pack suspension and road tyres. First and foremost it's my everyday car and I want it to remain as such.
Where to go from here? Is it my driving, not looking after my brakes well enough? Remove fog lights and liners prior to trackday? 4 pots? Had always thought, and stated on here, that they were a waste of money. But maybe they'd give the best of both worlds? How would they affect the braking balance, pedal feel? Would I just brake later and harder and still go through pads and discs? Have I just got to accept that I've got quicker and replacing pads/discs will be another expense of trackdays? I know Oulton is fast, is it particularly hard on brakes compared to other circuits?
Apologies for filling up this thread with my ramblings, had intended to start my own, but on finding this one didn't see the point.
And oh yeah, failed to keep it brief