While it’s true that some producers are associated with specific VST instruments (Serum is a popular choice for EDM and dance music producers, for example), just buying that instrument is no guarantee that you’ll instantly sound like them. You can buy the same race car as a Formula 1 driver but that won’t necessarily guarantee a win. Better yet, find out what VST synths are popular for your chosen genre of music and then learn them inside out. You’ll never sound exactly like Dr. Dre or Diplo but you will sound like you.