The difference being bbond is people building new commodity hardware PC's are not generally having to buy second hand "pulls" for CPU's. I need an i7 or AM3, I can buy one new in box at the store 1 mile from my house.
What happens when some guy buys a supposedly "working" '030 off ebay to slap in a theoretical "bare" ACA card, and said chip is DOA, or worse yet, could be mangled to the point it may cause damage to said ACA card?
From a business standpoint, I understand fully why they would not ever offer a "bare" board. Quality Control.