550k by the end seems very likely at this rate, and judging from the usual last-minute surge in pledges. A lot of the tiers are limited though, so the surge could itself be limited.
Red_Avatar: I import them from the UK ;) they're €45-50 here. But considering that every other game I pledged on, asked for, at most $30 for a digital copy of the game (and often only $15), £20 is quite expensive.
It's actually £15 minimum for a copy of the game, which is bit more expensive than most other video game Kickstarters, but nothing too crazy I think. Crazy would be the prices for
Elite: Dangerous.