Assume you seed 50% more than you use 1GB (10c in) + (15c * 1.5 seeding) + (15c download) = ~47.5 cents per GB ouch.
However, a blue ray rip is something like 8.5GB * 47.5 cents = 4.04$ which is not that bad. Assuming you get the actual content that you want, don't end up in jail etc, it’s still cheaper than HD PPV let alone buying the Disk.
Edit: I chose a BR rip as the lowest value content per GB, for most other uses it seems fairly reasonable.