it’s more than zero anyway. If you did not buy a dedicated hardware, and did not invest in to make it 24/7 online, any income will be a profit.
The whitepaper is said nothing about investments, so creating new capacity literally mean - add free space and bandwidth to the network and be awarded for that, it does not exactly mean to buy a new hardware, you may use used, refurbished or partially used for other puproses.
The fact is, you may run storagenode even on the router: Running node on OpenWRT router?