Wimproz is a very useful little piece of software that lets you calculate how the wimps offers compare to market price. Once you download it and unzip it, be sure to download the market prices for your server (English server 1, 2, 3, or 4). The next time you get a visit from a wimp (customer), copy it into wimproz, which will let you know how many points this offer is worth and also calculates the percentage from market price (e.g. 85% of market price). It also takes into account the market commission. Try it - its very simple to use.
The current version of WimProz can be downloaded here (.zip, 40K).
Current version: 1.22 (Windows only)
A Short User Manual
http://www.hermannseib.com/english/molehillempire.htm
The homepage of the people serving the WimProz is
http://preislistenpfleger.de
So, if you ever have a special question, pay them a visit (german page, english spoken).