Just buy the smallest gelat pack (6 months) then have it set to not resubscribe next month so that if you don't log on again for a month or even a few days you won't lose subscription points until you resubscribe manually.
I would recommend making an account, doing surveys using super rewards till you have 300 gelats, and try the main servers out for a month to see if you like it. If you do, buy it, if not, don't.
As an iPhone Graal player for two years, and a PC Graal player for a few months, I can safely say there are pros and cons on both sides. I ended up sticking with it. I recommend following Ph8's advice if you are interested, but still unsure of any final decisions.