Of course re-union albums are usually not too popular. There's something inherently synthetic about them, especially if none of the members were doing anything musically in the interim. It's one thing to break up but continue to grow musically then get back together, it's another thing to break up leave the industry all together then decide your having trouble making the mortgage and get back together.
I think the 80's taught us that.
Remember Starship? They should have stuck to reunion tours and played "White Rabbit" ad nauseam....