Justin,
I'm not sure you're not confusing scope here.
Everybody and their sister accept smaller blocks from their customers; we're
all talking about the DFZ here, not customer routes that you aggregate.
Actually, we don't.
From our customers, the most we are accepting today is a /24 and a
/48. This is for transit customers with their own AS and address
space.
Of course, if it's a DIA customer, we can assign longer prefixes,
but that is internal address space that belongs to us.