The value of your car wouldn't be very much, since the rear bumper is broken and the front one looks like the chrome is bad.
Yes, in good condition, they do go for crazy prices.
But, the original un-built kits do too ($75 +), and even ones that are already built seem to go for $30 +
I say go for it, if it's something you really want to build.
Oh, and really wether the promo has a friction motor or not is pretty much meaningless to a collector - the important thing is the condition.
Now, since one with a friction motor was more likely to be used as a toy, and bashed into things, the condition would likely be worse (like yours) so the value would be less...