My old plan cost me $20 a year for 80GB (without Google Drive). It's no longer offered, but I can continue with it if I wish.
The equivalent new plan would cost me $60 a year for 200GB (extra storage largely for Google Drive).
My per GB costs would therefore increase from 0.25$ to 0.30$; a 20% price hike. 
Curious. For now I'll stay with my old plan and the "free" 5GB of Google Drive storage.
 The numbers are better if you consider what I would actually use if I committed to Google Drive. I am using 20GB and thus paying $1/GB for storage I truly use. It may be that Google's prior prices were only profitable when most of the storage was not in use, which was likely given limited use options (primarily Picasa).