The industry professionals know who did what and who knows how.
It is so easy (if the money is available) to take a successful boat, make a few minor changes (that may, or may not affect performance), and make something different. Take that and throw an expensive paint job on it and you will have something that the general public deems a killer boat.
What I can't figure out is, how come NOBODY makes there copies look different? They all (Spectre, MTI, Motion, etc) look so simular to the Skater! WHY IS THIS? If I was in the boat business, I would be embarassed to build something that looks like the others!