We're planning to support a variety of services, not put all our eggs in one basket.
Tumblr, webstagram and all these sites do not offer the same service as us. Maybe our marketing needs work. We're paid because we allow you to CHOOSE ANY of your Instagram photos to make a portfolio from through caching a user's feed and using the realtime API to keep it up to date. All the other services simply wrap the API and show your photo stream - Now Instagram offers that too so these services offer nothing more.
But how hard is it to post photos to a custom theme'd tumblr for free? Being able to select which photos from the instagram feed end up on a tumblr page isn't a feature worth $5/month. It's trivial to share photos to both instagram and tumblr
Tumblr, webstagram and all these sites do not offer the same service as us. Maybe our marketing needs work. We're paid because we allow you to CHOOSE ANY of your Instagram photos to make a portfolio from through caching a user's feed and using the realtime API to keep it up to date. All the other services simply wrap the API and show your photo stream - Now Instagram offers that too so these services offer nothing more.