Okay, getting way off topic, but studies have shown that people actually do tend to see prices as being lower when the figure is more complicated (I don't know if believability has anything to do with it). Which is why stores in the US always sell things with 99 cent figures, for some reason $2.99 feels much cheaper than $3.00 when people's gut reactions are compared, even though they're pretty much the same. I found this out when deciding what to price sell our home at.
Sorry for the ramble.