Personaly, ever since I bought the game back when it costed 10$ quite a few years ago, and i know for a fact I have over a 1000 hours played, and enjoyed more or less 80% of it.
I can safely say I have gotten a good 10/1 ratio of enjoyment vs the amount of money spent, the game could easily double or even triple its purchase cost and still come out ahead in terms of playability and enjoyment even in its current alpha stage, and im sure many of the other old dogs feel the same way, and if it can do that now, imagine what the finished product can achieve?
on the other hand, being able to actually see your total play time can be a scary thing, i remember this one time back when i played WoW all those years ago,
I found out that you can actualy see how long you have played by typing in /played, so i did, and i had
YEARS of time logged in, makes you think "what the hell am i doing with my life?"