For $10 more (what's that, about eight Euros?), you could buy SublimeText or UltraEdit and get some of those new features you've been waiting for. At least run the 30 day trial to see for yourself. I use Sublime and it's been a good choice for me. Sublime also handles large files much better than TextMate. I've used it on Postgres dumps in the 4GB range just to see. Scrolling was slow on my MacBook Pro with only 8GB RAM, but I could do it.
As for getting big bucks for years, it's likely that Allan is tired of maintaining it. Version 1.5 is a great editor as is. Users always want more and he probably found a new shiny project to tickle his fancy. Releasing as GPL is a wonderful bit of philanthropy.