i always liked to make my own setups from scratch (i have enough knowledge to do it) and i learned more and more i did setups...til now i made something like an average of 300 setups for each car, changing testing adapting to my mood of the day
etc. i always found it a lot of fun and rewarding: my skills improved much more as long i made the car behave as my style/mood would require, i rarely like wr setups, so make my own helped my drive a lot, also i find very satisfing when a share my setup and see the guy improving...2 days ago i gave my fox setup at blackwood at one guy that couldn't brake the 1.11 barrier...well, after 5 laps he almost broke the 1.09 barrier.
making setups is not easy, i know, but is a lot of fun and on the long run it improves your driving skills too...so i suggest everyone to try it once in a while...
EDIT: i usually find that blackwood and fern bay green are two good tracks to make good base setups, after you have a good base for your driving style is much easier to adapt to tracks which require some adjustements