The guys doing this are pretty nasty pieces of work.
About 12 months ago, my next door neighbour in COMO had his S15 stolen (very nice car, big stereo, 19s etc). They broke into the house and stole his keys aswell. The saga did not stop here though.... He bought a new '04 WRX, and modded it also. About two months later someone at his gym was selling some 19s cheap, they turned out to be his. When he found out he approached the guy and told him it was his car they stole and he was gonna go to the cops etc.
The guys who stole the car took offence to this and came back to his house and trashed it. They once again tried to steal his wrx but couldn't get past the security code, instead they stole his gf's lancers' wheels and left it resting on the bodykit and wheel hubs out the front.