Because most peeps were frightened of off-brand purchases. The Laser 128 and Orange Micro were perfectly fine Apple ][ run-alikes, but Apple dealers spread enough FUD about compatibility that you had to be brave to go that route. Tandy had a heck of a time getting people to buy their PC compatibles, and were successful mainly cause every town had a RadioShack w/ a T1000 running Lotus & a few games to verify basic compatibility. Laser didn't have that benefit in the 80s. And if you were hip to CP/M you probably had the cash to buy a real Apple and add a MicroSoft CP/M card.