I also tend to go for color more than neutrals...at the moment I don't own a single brown bag, for example, and didn't own any black bags for quite a while until I went on a recent spate and bought a Rebecca Minkoff Black Haze Mini Beloved, an RM Black Haze 3 Zip Rocker, and a Belen Echandia Black Crash Love Me Midi. I also have two special orders awaiting me shortly: a BE black pebbled glossy Take Me Everywhere Midi, and an RM Black Stonewash Mini Beloved. I have a feeling that I will be selling one of my black bags at that point, however, because of some overlap.
Two other bags on my wishlist are a black Mulberry Bayswater and a MbMJ Sasha Petal to the Metal in (you guessed it!): black.
I don't think that you can have too many black bags if you use them all, and can legitimately afford them. For me, what makes each of these bags different are the details and the basic shape. Designers are amazingly creative with black this season is particular. Alternatively, for me there's nothing more boring than an unadorned black bag in mediocre leather, however. It's not like black clothing fabric, which lets you cheat a bit since most clothes, no matter how poorly constructed, tend to look at least a little more luxe in black. Nope...black pleather is anything but forgiving.