Op,
I've just been looking at some of your listings and many of them breach ebay policies:
You need to read the Keyword Spamming policy!:
http://pages.ebay.co.uk/help/policies/search-manipulation.html
Some of them are showing item location as Wirral, Merseyside , CHINA!!!! If items are being sent from China then you need to change to China only.
You cannot state different postage costs within the description or charge more post-auction. People bid/buy based on the information in the start price/BIN and in the P&P section.
You cannot state 'make me an offer' - it intimates an off-ebay transaction which is reportable.
You cannot state contact me for your requirements and I'll invoice you through PayPal. Again that constitutes an off-ebay transaction.

Want to improve your responding ? Click on the LOGO