[Rels]

You both seem to be saying the same thing to me? I'm not a English native, but I'm pretty sure a decade refers to a period of 10 years.

[mbauman]

How much it cost to operate for its first decade of life is certainly not representative of how much it'll cost for the next given how its archive and usage have grown significantly.

The grandparent implied that'd be the cost to run the site, the parent suggested it's not representative now.