It is the non-committal answer. the other '0' options have an attached attitude (interested, not interested, scam) and I people are choosing "other". Also, you

It is the non-committal answer. the other '0' options have an attached attitude (interested, not interested, scam) and I people are choosing "other". Also, you can own a fraction of a coin so 0-1 does not overlap completely with 1-9.