Who wears plates besides the military and the police? What do you think, plates will save you!?
First off, unless you are in a group, there is NOBODY to provide covering fire while you are lying there in excruciating pain. Whoever you're battling can just walk over and swiss cheese yer ass.
Second, plates are too small to provide all but most basic protection. You are more likely to get hit in extremities or non-covered area. If that happens, you have to be in a group to provide you with covering fire AND a medic.
In other words, it is far more likely you play pretend solder with plates and is most likely fat and unfit as well. Go eat a twinkie, Rambo!
You are better off spending your welfare check on firearm training and fitness for your immediate family.