I admit, I was thinking more along the lines of 1/4 mile racing. Still, let me take a shot at it.
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Someone said they were functional, and that the back of a FWD is not where you need the downforce, implying to me that the downforce was for traction. If not implying that, then why would downforce on the back be bad for a FWD car and not a RWD car?
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FWD cars are at an immediate disadvantage in that the downforce on their driven wheels is lessened the first second that they are put in motion. This same principal applies more downforce to the driven wheels in a RWD car. Anyway, anything that would increase the downforce on the back of a FWD car would make the driven wheels much more likely to spin, rather than grab. On a RWD, forward bite would be strengthened with a rear spoiler, but steering might become jeopardized. So, add a front air dam, which would help keep the front down, and improve steering. If you added a front air dam to a FWD car, it would certainly help, but you would still be fighting the affect of the rear spoiler. They'd be working against each other. What benefit would there be in applying even more downforce to the rear of a FWD car?
Take care,
~Chris