There are not many things that will quickly warp rotors. In your particular scenario, it sounds like you are warping then extremely quickly. 4 sets of rotors in 30K miles borders on ridiculous. Hell, every single aspect of my breaking system (including the pads) is what came with my car 34K miles ago. I do have a few follow up questions for you;
1) Did you get all 4 rotors replaced each of the 4 times? If not, please specify which rotors where replaced each time.
2) What mods do you have? Suspension power and esthetic mods, please.
3) Are the replacement rotors you received OEM replacements or 3rd party?
4) What pads do you use. If you have moved between manufacturers please list all of them.
Ill be honest with you right off the bat, there are few things that consistently and quickly warp rotors. The fastest way to warp rotors is to get them super duper hot then drive through standing water. Doing this once is probable, twice is plausible but three or even four times in 30K miles is inconceivable. Unless your driveway consists of a 5 mile downhill grade with a river at the bottom. The most common way people warp there rotors is prolonged light braking. This is incredibly easy to do subconsciously, especially if you drive on the freeway a lot. Many drivers will transition directly from the throttle to the brake to reduce or maintain speed instead of only lifting off the throttle and letting the drag of the drive line and wind/road resistance slow them down. Most people who are on a decline for prolonged periods of time will use the break to maintain speed, which is usually prolonged but light break application.
However, you state quite specifically that you don’t do these common things. You don’t use the break to maintain speed and you rarely apply the brakes on the freeway. That leaves only your spirited driving. What kind of roads do you drive? Is it mainly turns? If so are they slow sharp turns like you would find in the hills or is it longer sweeping turns? Is there much elevation change where you do your spirited driving?
If I had to make a guess based only on the information you have provided, and assuming that you are completely truthful about your daily ‘average’ driving habits (im not suggesting you’re a liar, but as I said before its commonly a subconscious habit) then I would say your breaking way too early for turns when driving in a spirited fashion and/or break early in general. To make a racing comparison, the proper application of the brakes requires you to start with the highest amount of force and then reduce that as you approach the turn, then transition smoothly from the brake to the throttle. Most drivers do the opposite, they gradually increase break pressure as the car slows down and then hold firm break pressure until its time to start moving again. Now, during your daily driving this might not be optimal nor advisable being that most of the people following you will get rather upset at the random WRX driver performing full fledged break test style stops as he approaches traffic lights. So when you’re on the road, just keep that theory and idea in mind. However, when your doing your spirited driving it could be beneficial to put it into practice. Before you get out on the road you should get familiar with what you car does and how it feels under full braking. Go someplace open, safe and dry, do 45mph and stand on the brake. The abs will kick in and you will chirp chirp chirp to a stop. Do this a couple times until you can maintain the maximum level of breaking before the abs starts to modulate for you. be aware that the point the abs starts to take control will differ widely based on the driving surface and the traction it provides. Then go back and do it at 55, then 65. Then just drive around for a while cool off those shoes. Try doing your spirited driving on the same road if possible and point out some braking markers for yourself. Remember where you start braking in relation to those markers, maybe it’s a half car length before/after maybe its two car lengths. Then, over time, VERY VERY VERY GRADUALLY reduce those distances. This will get you familiar with the cars ability to slow down and allow you to more effectively use your available stopping power. if i had to guess, you just dont know the full stopping capabilities of the car and are over compensating.
Note: I use the terms “many drivers” and “most people” a lot. Im not stating you do this specifically, just playing the numbers.