The basic problem with Warp 10 is its asymptotic. Any time you cut your distance to warp 10 in half, you double your mass, and hence need twice as much fuel. Therefore, as you approach warp speed, your mass approaches infinity.
Of course, it doesn't seem to YOU like your mass is increasing. To YOU, the Newtonian physics seem consistent; Your perspective is increasingly warped. Again, every time you half your distance to warp 10, your experience of time is cut in half. You don't SENSE that to achieve ever-decreasing rates of acceleration, ever-increasing amounts of time pass for those you are zooming past. YOU sense you are continuing your acceleration at a linear rate (if I've got that right), but time is flying by at exponentially greater speeds, until, before you know it, the universe has already collapsed apon itself.
Of course, you will experience this as merely having travelled beyond the reaches of the universe.
That recent photo of William Shatner looks like he has spent too much time at worp speed and has gained mass.
I thought there was an episode of "the next generation" where you can go unbelievably fast if an alien and the doctor's weenie kid concentrate really hard. The side benefit is that you get rid of the weenie kid at the end of the episode.