This is like making a McDonalds because everyone says they want it their way but deep down the truth is we just want an In-N-Out menu of 5 things. And the McDonald's way is bloated, slow, expensive, and dying.
When it comes to mass-customization, there's actually a lot of evidence that shows people do want more choice. You're seeing it with products like Moto X and NikeiD. Or even with what Apple is doing with the Watch. It's logistically more difficult to pull off, but it's doable online.
(Maybe not the best link, but it shows what I'm talking about.)