Think of it like this:
average price per game today around 39-49 euros. SBP around 95 Euro. that is SBP equals the price of 2 - 2.25 average games
Life expectancy od average game: measured in months.
for SBP, including dedicated support, addons: several years.
If you stay with it that long is a question of taste, of course. SB-players I know stayed with it since 1999 so far (if I do not mistake the first release of SB1).
All other questions answered in depth in my review.
