Considering a £300 console (e.g. PS3) is generally sold at a loss, do you really think an end user without advanced manufacturing processes is going to be able to make one for 1/10th the cost?
Considering that you're comparing completely incomparable costs, do you really think that your point is valid?
There are considerable costs involved in selling a console today that would not apply to a console printed at home from pirated plans:
Buying hardware from other companies, which will include all of their costs and their profit.
Buying manufacturing from other companies, which will include all of their costs and their profit.
Buying packaging and transportation of the relatively heavy and bulky finished product from other companies, which will include all of their costs and their profit.
Customer support costs.
Profit for the end retailer, unless they also take a loss and make it up on game sales.
So you're comparing a completely different manufacturing process without any of those costs. It's not a valid comparison. With a printed item using free plans, the only cost is the materials and the electricity. While it's nowhere near possible to print a console for 10% of the retail cost today, it's not inconceivable that it could become so at some point in the foreseeable future.