timbee:
This is really common tactic by REA's on Trademe. When we were looking for our first home we would put in our search criteria range of like <600k and then find these nice houses so we email them for a rough price point and they would come back with and say 900 - 980k. We would then say can you remove it from showing up 600k to stop wasting peoples time and they would just go quiet.
I would guess it's so they can show their (pumped up) view numbers to try to justify their pay to the seller. "We saw a gain of X viewers this last week, there is definitely increased interest!"

