Fictional scenario: company X makes a thousand Doozies(TM) in 2010 at a cost of $100 each and places a retail price of $500. The Doozies(TM) start selling in fits and bursts over seven years, consuming about half of them. Now the expected lifetime is 100 years, a virtual "forever".
Now we get into accounting flim-flammery. Each year, twenty percent of the original "value" is written of as a loss AKA "depreciation". [Say the law allows this or even more.] Never mind the quality and usefulness remains constant for the Doozies(TM) by design.
Firstly who determines this "value" and what exactly is it - the actual cost of manufacturing, or the retail price? And at the end of 5 years, the "book" value is zero. But one sells more after the 5 years - is the IRS profit an infinite percentage, and the total price the taxable income? After all, the cost of manufacturing has been "written off", which can be done only once.
So it behooves one to sell those Doozies(TM) yesterday before the value goes to zero and taxable profit becomes an infinite percentage.
What gives?