You will get the idiots who bid on everything and or are at the other end of the country.
Some won`t read it correctly, eg if you want OWO and it`s not offered on their profile, ask them if they will do it in the price.
Also, I always ask them to leave their number when replying, saves time and I also ask them what is the latest they need to know by.
Another thing, I always email the unsuccessful one`s and thank them for their bid and that i`ve bookmarked their profiles for the future.
A lot will say that if you do book them in the future, they will do it at the reverse bid price, there`s a few that I see on a regular basis and they charge the reverse bid price every time.