Why? because they are not easily available here, and they are quite expensive.
The dampers I bought retail at £80 + 20% tax, I deal with AVO alot through work, I recieve a healthy discount, the dampers did not cost me £80.
It was more cost effective for me to do this, and I have the added bonus of adjustability.
Incidentaly, I have adjusted them to get them to where I like the damping to be, i can alter each damper individually, i can make them firmer for on road so i can go fast around corners, i can make them soft for off road use, personally I prefer to be able to set the dampers how i like them.
I also have them on my T3, i can have them hard for driving like an idiot, or i can have them comfortable for the children.
I'm not offering them for sale, they are one off items, I'm not trying to sell them I just thought forum users may be interested.
I did consider the Trailmaster items but I read mixed reviews about them, an expensive risk to take if I did not enjoy the ride.
At least with the AVO items it is not a big risk, they are not too expensive for it to matter.
At the moment I am really pleased with them.