Rolf,
there is always a tradeoff between Higher tech and light weight vs cost. I don't think synthetic rigging is worth the cost and hassle vs weight savings.

You can build a moderately high tech boat (A cat like levals of technology) without going up wildly in price.

On the other hand Jim Boyer tried to import taipan 5.7's into the US and no one bought them. They were a sweet sailing, well built boat that was 170 lbs lighter then the nacra 6.0 it competed against. The problem was it was 3-4000$ more then the nacra and not that much faster. It sure was alot nicer to sail though. All that means nothing if people don't buy them.