Using the most expensive school is NOT necessarily a good idea. Some of the most expensive schools also have the most generous need based aid and even for higher income earners.
For example…if you use Princeton or Yale or Harvard net price calculator (they are expensive schools with very generous need based aid for even higher income earners) this will have NO relationship to less costly schools with less generous need based aid policies.
The net cost you get for H, P, Y is likely to be less than for many other colleges with less generous need based aid awarding policies.
Also, many…many of these generous schools use the CSS Profile or their own financial aid form (Princeton has its own form)…and their institutional need based aid is determined using the info on the Profile or their form…not the FAFSA.