Like every other industry, there's a growth period where things are new and prices are reasonable, and then there's the "squeeze" where bean counters come in, make charts that are likely bs, and explain how much easier it'd be if we charged 4x as much for half the customer base.
Twitter was one of the first to give access to cheap mass data, and now they're one of the first to charge through the nose for that. The move is going to be that if you're not enterprise level you're not getting this data anymore, and I doubt it stops with reddit.
Now, I'm not surprised to see _Twitter_ doing this, because it's just one of a laundry-list of ideas that Naughty Old Mr Car has to make Twitter worse; it really barely registers. But _Reddit_, I would have thought, would be a lot more conservative in the "massive dangerous change" department, particularly after what happened to Digg (and more generally the history of internet forums). I'd expect that there's a huge danger for them here that the big third party apps will simply endorse a Reddit clone.