Cause it's expensive as fuck, trade cost as much as the Brooks does in retail.
I loved mine, really comfortable, for the first 10 minutes I thought I have less pressure in the tyres only to realised it's the saddle that was giving.
Only nag is that it's missing the cut out that I enjoyed from the Selle Anatomica saddle.
Moment I lend it to a friend, Brooks announced a cut-out version that's coming out;
Motherfuckers. I haven't even fitted mine yet.