Because you don't stop paying developers starting the second year?
If they spent a million, made a million, and are now back to square one, it would make more sense to not amortize the investment because it's not an investment.
It's also pretty harsh on a business that's just plain unprofitable. The laws should be arranged so that if you start a business and it's a flop, but you have no debts, you can walk away pretty much unscathed.