Aquatic puts you in Redhook which is still quite a drive to the airport. The 7:30AM is direct right into Charlotte Amalie whereas the Aquatic routes through St John and then you still have that long and expensive taxi ride. So for the extra hour of sleep you get, you are stuck traveling alot more (and paying alot more too). We just paid $135 not including tip to go from the airport to the water taxi dock in Redhook.
This is all assuming you are coming from Tortola. Depending on the day of the week, that timing would help folks coming over from VG and Jost.