Ok I finally stopped laughing and checked the calculation. Depending on your power and your weight, if you really had a 30lb bike, you'd be around .15 mph faster on the flats if you bought a 15lb bike.
If you went from the least aero (probably ever tested), to most aero bike (claimed), with helmet, kit, tires etc... and saved the "advertised" 5 minutes over a 40km time trial, your 17.3mph would become 18.9mph or 1.6mph faster.
So to add up all that money can buy, a 17mph rider can buy all of the "speed" money can gain him/her and maybe gain 2mph (if the ads are indeed true) on a solo 40km time trial. The irony is a solo 40km time trial would be best done on a time trial bike, and since road cyclists often ride in groups, your $12000 buys you absolutely zero while in someone else's draft.