It requires are crew of five (not including the up-to 11 scientists). Much of the science would probably be better off without noise introduced by crew and the generators.
Scientists might be better off with an unmanned battery powered platform. Or unmanned ROVs.
And if you do need a manned platform, the deep sea oil industry now operates hundreds of them. It might be cheaper for scientists to simply piggy-back on those.
Not that much cheaper. At least in the US based oil companies I have worked with, the cost of sending even one person to an offshore platform can easily exceed 20k USD. Everyone on the platform has to have extensive safety training. Only a few training facilities are setup to do things like Helicopter Underwater Escape Training [1] so the cost is pretty high.