The technique I use for pre-foreclosures is doing everything I can to keep them in their home (and still make money). Only as a last resort do I suggest they sell, and then I try very hard to get them a fair price (80% FMV or so).
Some states, as you rightly point out, have recently enacted laws making it almost impossible to buy a pre-foreclosure home and then resell it. I don't personally know about IL, but Maryland is one of them, too. If you resell the house within a certain amount of time, you have to give a % of the profit to the people who sold you the home.
Fortunately, NH has no such silly laws.
Seems to me that this defeats the purpose, and it's going to be a lot harder for people to get rescued. That said, if you focus on other ways to help people in pre-foreclosure, you'll make money and potentially be a hero at the same time.
[Whatever you do, don't buy it from them and rent it back to them!]