Believe it or not, not everybody needs, wants, or can afford the latest technology.
So what you are saying is, for the sake of saving an extra £60, you decided to buy out-dated technology, and will almost certainly make a much bigger loss when you come to sell it relative to what you would lose on an iPad 2... Rather short-term thinking, no? The fact is, if you can afford £300+ for an iPad, you can afford £400+ or an iPad 2, but people get so caught up in tiny financial details...
People need to start considering that in the future as more people buy iPads the resale market on these is going to be closer to resembling the iPod Touch than the iPhone. Currently the newest IPod Touch resells for about 40% of it's current value on sites like Gazelle compared to about 75% for the iPad now.
Expect the spread between these two devices to narrow over time. Whenever the iPad 3 comes out my guess is resale value of the iPad 2 will be closer to 40% than it will 75%.