Yes, the market(for lugers and guns in general) ebbs and flows.
Within a venue, monthly, yearly, and in longer boom/bust cycles too.
Generally tax time is good to sell, folks have tax refunds(or not).
Christmas/New Year and mid-summer vacation time are generally good times to buy; when folks spend their money and "time" on other things.
Basically- don't worry about it! As 4 Scale said, just be "patient".