SeanMartin sums up the main reason, I think.

If you're going to give up on Content Paradise, make damn sure you have copies of any serial number you may need for on-line purchases.

And if Poser goes into Ozymandias mode (along with Truespace?) it's not going to stop me making pictures. It's a pretty decent tool. with a lot of extras out there.

It's still possible to write a novel with Wordstar, after all.