Because right now, we can pay a one time fee and use the software as long as we want, without incurring any more cost in return for not getting updates or imposing a cost on JetBrains.
However, from November, that will no longer be possible. If Jetbrains decides, in 2016, to increase the license fee to $300 per year, or $500, then we will have 2 options: Pay it and continue to have access, or don't pay, and lose all access to the tools, despite the fact that we have already given you money. If I have a cashflow problem, I can no longer decide to stay with last year's version for a while, instead I lose access.
I'm sure you know this, I'm sure everyone at JetBrains knows this.
However, from November, that will no longer be possible. If Jetbrains decides, in 2016, to increase the license fee to $300 per year, or $500, then we will have 2 options: Pay it and continue to have access, or don't pay, and lose all access to the tools, despite the fact that we have already given you money. If I have a cashflow problem, I can no longer decide to stay with last year's version for a while, instead I lose access.
I'm sure you know this, I'm sure everyone at JetBrains knows this.