the rotor's reliability also comes down to the individual driver.
some people believe you can rev a stock engine to 12k all day, so they do and they blow up. then they say, "ok i'll get another". instead of learning from their mistakes, they rev it to 12k all day. that motor goes pop too.
conclusion - rotaries blow up easily, are unreliable and need frequent rebuilds.
this is a common problem. it's called "ignorance" and breeds like wildfire.
that said, the 240SX (200SX in OZ) is still a great car, add a 1UZ and it should be a weapon. trust me, you won't miss the KA24DE at all...!