My suspicion is perhaps someone said "Make them free! We'll make _heaps_ more out of the sales than they cost!", and someone else (probably a greybeard with enough experience to remember) said "Hey, remember CueCat? Maybe we need to 'sell' them for at least enough that when someone works out a good use for them that _doesn't_ result in retail sales, we won't be too unhappy with people flocking to grab them from us..."
My suspicion is perhaps someone said "Make them free! We'll make _heaps_ more out of the sales than they cost!", and someone else (probably a greybeard with enough experience to remember) said "Hey, remember CueCat? Maybe we need to 'sell' them for at least enough that when someone works out a good use for them that _doesn't_ result in retail sales, we won't be too unhappy with people flocking to grab them from us..."