From when I worked there they (the drivers not the guys in charge) told me it was around 100$ for a signature. Not sure though on the exact amount. I do know I watched the driver I was assigned with forge people's names left and right, but then again we also delivered to rural areas and hid the packages so people couldnt see from the street. But that driver was also the one who said "Yeah im fucked if they find out I forged this signature, but they don't give me time for getting it".
Now that was during Christmas time, and UPS is rushed to the fucking max, so I wouldn't take advantage of them (the drivers) around that time, as UPS only gives them a certain amount of time to deliver more and more packages, but around summer they STILL pull the same shit and there's hardly any rush for deliveries.
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But no, my $500 computer parts, laptop, and anything else you don't want to get rained on they leave on the porch.... generally as far away from the door as they can get, just in case it does start to rain.