From the posts i have read Neil and my peronal view i think people would be happy to pay around the 100 pound mark. Think most on here do domestic work which obviously mostly involves kitchen and bathroom work. People seem to not need a laser that is accurate at a huge distance, mainly working in small spaces.
Think a laser around the 100 mark is more than suitable for most.
Easy to set up, not too expensive and accurate enough for the main jobs a domestic
tiler will be doing (bathrooms and kitchens).
I myself wouldn't pay 200 for a laser when i know i can walk in B and Q and pick up a Bosch for 80 quid that is more than good enough for the work i do.