Ha, it is just like the stock market. The more you drumbeat the Canonet, the more the lurkers will drive up the prices. If you want to depress prices, start to post compliants about them on all the forums - and watch the prices plummet.
For a couple thousand you could corner the market on used Canonets sold at discount, and then slowly build a campaign to raise the price so you can sell high. Don't laugh - business does it with billion dollar companies all the time.