I think I've played the demo for more than 2 years (0.1 to 0.2 until S1 was there) and It never was boring, so maybe the demo gives you already too much...
And still there are people asking for more...
I was happy to buy S1 and I was happy to buy S2, so much new things to discover
So if you could save 6€ a week, you could buy yourself S2 in only a month
That's about 0,86€ per day, 3,6 cent per hour.
I would be quite suprised if you couldn't save that money in one month