For Textkit's library of PDFs, I have required user registration and login. The login system is through the Wordpress platform. The day is coming where we will migrate our current forum under PHPBB to wordpress BB but not until both wordpress and wordpressBB can share a common user management system - right now they don't.
I put the files behind a user login because too many bots were downloading the files and since Textkit's files are now on Rackspace's Content Delivery Network, I need to prevent that. I actually don't mind bots. Bots are good - most of the time. After the change, daily bandwidth went down from 7GB to about .5 GB. A sizable difference. At the rate of 7GB a day, that worked out to about $375 a year in unneeded cost. At .5, it's quite fine and more than covered by Textkit's ads running in the forum. I initially thought my bandwidth consumption on natural traffic was less than that, but half a gig a day looks to be what it's at. I wrote a blog about this showing a cost of about $4 a year on the CDN, and it's looking more like $28 or so which I can live with and it's WAY better than 7 or 8 years ago.
So that's why the change was made. What's fun however is to see all the accounts pour in. Right now I'm seeing about 200 new user accounts a day and at least now with a registration we can think about some ways to reach back at this audience for further engagement.
thanks
Jeff

