In reply to DannyH:
As Pok mentioned, WP zips are available and you don't have to send it to an outdoor specialist repairer if you don't want to. The richer, bigger, outdoor companies will replace the entire jacket as they can easily afford the cost and often profit a second time when loyal customers declare how happy they are with their service. Perhaps Goretex take the hit as they regulate everything that goes into the jacket anyway.
Wax crayon, candle, stick of beeswax from the chandlers or sewing shop...perhaps even white synthetic grease from the bike shop...always apply it sparingly. McNett sells a zip cleaner and lube all in one, aimed at tents I think, as well as some overpriced wax blocks for wetsuits and outdoor clothing.
Sometimes it is a trade off in different functions with zips: smoother zips often have the locks missing (Arcteryx); waterproof zips are stiffer than water-resistant zips --- RiRi (Crux) are smoother than Aquaseal (ME, Norrona) which are probably smoother than the TiZip things on heavy duty luggage.
The water-resistant reverse coil zips seem to be replaced with water-resistant/proof moulded plastic zips on a lot of higher-end jackets, especially for the main front, which is good as the former don't last more than 10 years in my experience. There have been more than one type of WR reverse coil, however --- the worst I have seen is the ones used by Patagonia and the best was one used by Mountain Hardwear; I have no idea what materials but they were very different.
I don't think velcro flaps is a better solution but it certainly doesn't scream "planned obsolescence" as the WR zips do.
Jon