Well about the seals , i believe it is a great deal on how you can preserve them from dust.I clean as often as I can any kind of dust from the forks' legs all the way where the seals touch, so i have about 25+k km now and counting. Avoid also wet driving as much as I can,as well.
i don't think on changing my WP , for the reasons you mentioned (perhaps some springs will be added latter) plus they are easy on maitainance.
BTW , hoe do I find what kid of springs do I get in there? Don't need any harder , just the same. Does the manual states , or do I just have to open the forks and count the length, and what about preload strangth and so on, (perhaps WP has the same standard on this length and don't need to further search? )
Any idea what the springs can cost.
I can get new WP like mine for 300-350Euro in ebay though.