John in response to the above I think a very sensible idea already exists on other posts/threads, and that is to separate out those clans who can seige and those who can't.

If both clans can seige then the triple points will measure the best seige and/or the most successful attack on the opposing seige.

For those clans who can't seige if opposing each other the triple point effect will be eliminated.

I accept with this there will be occasions where 1 clan builds a tower and holds a seige, but this would be a one time gain.