Also because there was a ready supply of "new" pre 10/21/98 pistols, so they could be sold in MA.
CZ-USA does not plan to certify their new pistols for sale here, when I called them last month.
The CZ is also big and heavy compared to a lot of newer pistols, so like the M1911, it's quite comfortable to shoot. So a lot of people who actually buy guns to shoot buy them.
And to think I could have bought one at a military Rod & Gun club for less than $200.....