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On 200TW tires: That's the standard minimum TW in most pro-touring series. Also note that even SCCA is moving their street tire classes toward 200TW tires. Unless things change, in 2015 all street tire SCCA Solo classes are going to require 200TW tires. 200TW is becoming the standard. What difference does it make as long as everyone is on the same TW?
Problem is that the 200TW is not a standard in of itself. Meaning that a 200TW tire by one company is not the same rating as one by another. Tire companies get to set up what 200TW means to them. Some companies even use a different scale for different models of tires. This number is only useful for relative readings within one manufacturers line and sometimes tire model specific. The scale one company uses is not the same scale as another. Its a basic problem. Not until an adopted scientific standard that is used by all companies will 200TW mean anything. At this point it is fairly arbitrary other than it means a performance/competition type of tire.
Damon 
It's the same whether the TW rating is 140, 200, or 500. 200 is just what everyone has seemed to settle on. I know SCCA's decision to move toward a 200TW rating is due to tire manufactuers indicating that they are moving away from making 140TW UHP tires. 200TW has been the standard with the Pro-Touring series from almost the beginning. It is what it is.
Again, the minimum weight came from input from competitors. 3000# was chosen because it was the weight most frequently mentioned and as AMX said, it's easier to add weight and the vast majority of these cars weigh more than 3000#. The upside to the weight rule as written is that you can put the weight where it will hurt you the least. I'd much rather have to deal with coming up to a minimum weight then try to figure out how to lose weight. Adding weight is easy, losing weight is hard.
Dave Dusterberg
1979 Aspen R/T (soon to be #19 CAM/T)
2002 Ram 1500 SLT
2005 Magnum R/T
2005 Mustang GT SCCA CAM/C #19
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