The price has been in the range (400, 700) for the last 7 months. We are currently at 585, so in the upper part of the range. If you make the range smaller, say (500, 600) then it's not so stable. If you take the first range, as I did, then it's pretty stable.  So it depends on how you read the data. There are a few sites in which you can see the long term price data.
But of course, none of the past data is a guarantee for the future, we may see 2000, 10.000, 300.. anything - but I think this is part of the fun