considering you would be sitting on the bump stops (unless you removed them too) the shocks wouldn't really be moving, so they might not wear out, on the other hand I don' t think they would like staying fully compressed permanently.
The tires would wear quickly caused by excessive camber from the car sitting too low, wheel would be like this /--\.
The tierods would also be at an angle the wouldn't like and would wear out quickly, but if your just doing the rear you don't have to worry about that unless it's four wheel steer.
The bushings will wear out quickly especially if they are already old.
The most likely to be damaged part are your internal organs, have you ever been in a car with no suspension travel? After half an hour you start feeling like a trip to the hospital.
Now before you start on about being dangerous/illegal, blah blah blah...I KNOW ALL THAT...this is purely for research...
If your even tempted to try this it will handle like crap and it's a good way to kill yourself when at speed - I've seen that happen before.