Actually, there are a number of Class D amps available for Home Audio. Bel Canto, for example, offers a number of Class D amps. I believe NuForce does so also. There are others as well.
The real issue has been acceptance of Class D by audiophiles. The amps have a mixed reputation -- some listeners enjoy the detail Class D amps reveal in recordings, while others do not like the hard edge many Class D amps add to higher frequencies. I, for example, briefly owned a Bel Canto amp -- I didn't like the sound at all. But it is a matter of taste, so YMMV.
The real issue has been acceptance of Class D by audiophiles. The amps have a mixed reputation -- some listeners enjoy the detail Class D amps reveal in recordings, while others do not like the hard edge many Class D amps add to higher frequencies. I, for example, briefly owned a Bel Canto amp -- I didn't like the sound at all. But it is a matter of taste, so YMMV.