Evenstar
You are absolutely correct; you do have every right to be out in the main parts of the lake in your kayak. And, motorboat operators have an absolute duty to be aware of your presence and avoid you!
With that said, FLL is correct in saying that a kayak is not always easy to spot (for anyone, not just performance boaters).
If some nincompoop is outrunning his "good visibity distance" (something I've seen all manner of boats doing, not just performance boats), I'm not at all certain that the extra second you spoke of in an earlier post will be enough time for the average person to react, or for the boat to turn enough to miss you.
To be brutally honest, if said nincompoop runs you down, I fear that the difference between the results of a 90 mph collision and a 45 mph collision (or even a 25 mph collision) will not be terribly significant. Please, please don't count on the speed limit to assure your safety!
It seems to me that your situation is similar to that of a jogger running along the side of a road. The jogger has an unquestionable right to be there, and drivers have an absolute obligation to avoid hitting him or her. But, a smart jogger will wear high visibility clothing to help assure that drivers see them! (Heck, even 50+ years ago, my mother made me wear a light colored jacket at night!
)
You shouldn't have to, just as the jogger shouldn't need to wear a reflective vest, but please consider someone's earlier suggestion that you mount a fiberglass whip and flag to your kayak! I'd really, really hate to read some day that you were run down!
Silver Duck