Do I understand you well, that Meisterklasse last longer? If it is so,it happens only if you take yourself back. Meisterklasse harps with their chrom plated reed plates have narrower slots and take less wind to play, so if you want, you could play them louder than other harps. And if you do so, they will last shorter. But it is the same to me.
Because I spend more money on them, I try to get my expression with less volume, which is possible I think.
I remember a meeting with the Hohner people in Trossingen, 6 years ago, and the first thing they asked us: Do Meisterklasse break earlier than other models?"
BTW, I don't like the sound of the metal body of the MS-MKs and use only the reed plates with Marine band combs and covers.