For some people, flight times and airline and connecting city don't matter, price does. Many people still believe as you get closer, the price drops, so they will wait. Sometimes it works, sometimes it doesn't.

Many people don't plan, or can't plan their trips that far in advance. We've been known to decide to go to Italy for a week for example with only a couple weeks notice.

Honestly I would never book a flight with only an hour connection in FRA. Everybody has what they feel is important when they book, for some it's price, for some it's the minimum connection time, for others it's the type of plane, etc.