No, Dune is a very expensive ripoff of Star Wars. The actual ripoff was cheap. Frank Herbert watched Star Wars on opening night in 1977, then cribbed a bunch of notes, changed the name of the planet Tatooine to Arrakis, changed the name of Luke Skywalker to Paul Atreides, and pretty much left everything else the same.
The expensive part was building a time machine so that he could go back in time and publish Dune in 1965, twelve years before Star Wars came out. Frank Herbert spent his entire family fortune building his time machine, and even had to sell his family ranch in California and the family’s stock in General Electric. Most scholars consider it one of the most expensive, if not _the_ most expensive, cases of plagiarism in the 20th century.