I believe in almost any case, it is almost a wash if someone in your lineup hits against your PS. I'm sure you all did the math, but here goes (this assumes no one else is on base):

Single: 1 base for offense; -1 for PS = 0
Double: 2 bases for O; -1 for PS= 1
Triple: 3 bases for O; -1 for PS=2
Homerun= 4 bases, 1 RBI, 1 Run for O; -3 for ER, -1 Hit= 2 points

I guess 2 points is better than nothing.