Low mintage on Philharmonics? The question begs itself--- So what? The Phils are close to if not the lowest premium tube silver coin available today (at least in the US). They're almost always even with the spotted and mint-damaged Maples for lowest premium. If they have an ultra-low mintage year, maybe they'll climb up to being the second-cheapest tube silver coin (?)... I don't think I've ever heard of any serious Philharmonic collectors like I have with Kooks, Lunars, Britannias, Pandas and even ASEs.
I actually like the Phils. I think the aesthetics are good and I don't much care about the plain edge---if anything, I think it's distinctive. Unfortunately, they're not very liquid in the US. Dealers don't like them and frequently treat and price them like generic rounds.