I doubt this is about price like some people in here are suggesting. Maybe a little bit overall market trend, but primarily I would wager it’s because many, many people bought the M1 when it came out and it’s so good that the only people buying M2 are those who waited - it’s a fine spec bump, but not something you would be tempted to upgrade from M1 for.
Regular consumers do not buy a regular laptop for 2000+ €.