According to the man himself in this very short candid conversation:
“because it has the best chip architecture and the most advanced operating system”
The Fortune as advertised (“Fortune 32:16 - Minicomputer Performance at Microcomputer Price”) at the wonderful nosher.net
See also
quite a sensation when Fortune announced at the COMDEX 1981 a powerful business-oriented computer at the price of only $5000. The model, the Fortune 32:16 with a promised 128k of RAM, Unix, and a 1.5 MB floppy disk drive was one of the first 68000-based computers
Also here
A wide range of high quality business application software was available, as well as programming languages, like a very extended BASIC able to convert code written in other BASICs (AppleSoft, MBASIC, CBASIC, TRS-80 BASIC), PASCAL, FORTRAN 77, COBOL and, of course, C language.
The 32:16 was also built and sold in France by Thomson under the name of Micromega 32
via DragonFly Digest