Marcus Fehn in Ulysses Switches to Subscription:
As of today, we’re changing Ulysses’ payment model. It’s still the same Ulysses, same features, same distribution, we’re just switching to subscription. For $4.99 per month or just $39.99 per year, you can now use Ulysses on all your Macs, iPads and iPhones, including sync. You no longer need to buy two separate versions for either platform – from now on, it’s just Ulysses, and you can use it wherever you want.
Things are not black and white. I don't like subscriptions, but when I use something on a daily basis, asking for 30€ a year is the least I can give.
I can understand that people don't want to have 10 subscriptions. I don't want them either. It's about picking your priorities and choose which ones you really need. Nobody cares about the number of Apps you have installed, it's what you use them for.
If you need more reasonable arguments about why software companies need a regular income, I recommend you to read Why we’re switching Ulysses to Subscription.