The way I understood it is that Newegg actually gets cash, guaranteed from a third party that takes bitcoin.
This is how most businesses take it, via Bitpay or Coinbase. The only large company I know of that keeps some of the coins is Overstock, whose CEO has already proclaimed he plans on expanding the Bitcoin economy considerably.
Ultimately it is irrelevant whether they treat Bitcoin as a payment system or a currency, it is better at both than any other legacy system.