Well with bolt ons and a good tune these cars are already pushing 500 hp at the crank. Thats pretty badass for a N/A 302. Might as well sound the part.
I don't think it's ricey, it just sounds awesome. I drool over an idle like this. Doesn't mean your trying to fool someone into thinking your car makes another 30 hp.
Cams have never really been worth the money on these modular engines anyway. Many have done NSR cams on the 4.6 JUST for sound. At least this offers a MUCH cheaper way of doing it.