Why do all the auction houses have auctions at the same time?

[Topnotchsy]

It's auction season now (obviously) and just about every major sports auction house seems to have an auction that either just ended, or is currently running. This was following a 2 month period (or so) with very, very few major auctions running.

Is there any logic or rationale to this? For me I know that at times it means I have to prioritize which items I really want since I know that there's no way I can afford all the items that look interesting.

Is there any reason the auction houses do it this way?

[Stonepony]

I suppose when you get into a Winter, Spring, Fall cycle it's hard to break out of when you need several months between to acquire quality consignments. Actually i see a pretty nice spread across all seasons as Goodwin, MH, ML tend to have more offerings dates than just the major seasons.

[Snapolit1]

Sure running major auctions in the summer is a lousy idea, as people are on vacation, leaving the country, just kicking back, etc.