Mr Bollocks, I note you've changed your avatar again.
Oh come now Horse...
Your precise quote was, "All high end wheels use alu alloy spoke. It's the only safe-bet way to get the weight down below 1500g. This goes for both Fulcrum and Mavic."
Actually, Mavic and Campagnolo both use steel spokes in their highest-end wheels. Zipp, Reynolds, DT, Shimano, Fulcrum, Tune, and every other top tier wheel manufacturer uses steel spokes - except when they use carbon like Lightweight, Corima, Reynolds, MadFibre, etc. In fact I can't think of a single 'best' wheel on the market with alu spokes.
D-Ace/Ultegra C24 are being discussed in this topic and both use steel spoke. They are also considered high-end. So I am obviously not talking about every wheel. Taking the point out of context. It's a moot issue as the point has been made.
If you wish to discuss specifics let's do that.
As for being the only way to get under 1500g, that is certainly not true either - regardless of whether you are talking about alloy clinchers or carbon tubulars.
Again, Alu spokes are about ease of building for manufacturers who are looking to maximize profit margins. They are popular due to marketing and the fact that they rarely need to be trued because the spokes don't load/unload to the same extent that steel spokes do. Beyond a moderate weight savings over steel spokes, there is nothing better about Alu spokes on the road than steel. And in reality, the detrimental effect that alu spokes have on aerodynamics far outweighs saving 20g per wheel in a majority of riding conditions for most riders.
I'm not trying to point a blunt finger (whatever that means), I'm simply stating that your assertions are incorrect and providing evidence as to why.
1500g is a reasonable place to benchmark wheelset weight. Anything on either side can be discriminated between High-Spec and Entry-Level. Personally, I don't advocate an alu over steel spoke. OTOH I also consider a fair number of entry level products to be superior to their high-end counterparts. Horses for Courses if you will -- if you''ll pardon the pun.