SWG Credits players will have lost potential profit.
As with any manufacturing job, it's important to sell your item for more than you could sell the components for, otherwise SWG Credits players will have lost potential profit. Just because you salvaged the parts yourself does not mean the rig you build from them is free. There is a thriving rig component market out there and it may be that you could sell the components faster and for more ISK than the finished product. The blueprint originals for the Tech I version of each rig are available cheaply on the market and you can usually find pre-researched blueprint copies for sale on the contracts system.