It appears several of the webmasters are reluctant to sign up for Bluesnap because of USD75 per month maintenance fee levied on developers that sell anything less than 2,500 USD per month.
Check out these discussions:
http://www.webhostingtalk.com/showthread.php?t=1276084
https://forums.digitalpoint.com/threads/review-of-plimus-bluesnap-and-gumroad.2633411/
http://forums.indiegamer.com/showthread.php?35658-Everybody-avoid-Bluesnap-%28ex-Plimus%29-at-all-costs
Suggested alternatives include FastSpring.com and BMT Micro
Is there any change to $75/month minimum charges that BlueSnap levies on merchants?