No, there is nothing wrong with them. Leave them alone if you like them that way and don't mess with "Mother Nature" as they say.
Muffin (1991-2005) in my avatar had droopy ears also. I loved them. She had an adorable cute face. I never did anything to make them stand up and neither did the breeder.
Now I have little Kacee (3 months old today) and I when I went to pick her out before I could bring her home and shame on me, but I told the breeder not to tape her ears at all. I love those floppy ears. I'm not a snob about them at all.
If you would like to "attempt" to make your baby's ears stand, you will want to trim the hair off of the upper third of her ears. You can also cut masking tape, I believe, in triangles and place on the inside of the ears to help support them. If I'm remembering any of this incorrectly, someone will correct me.
Edit time. I missed your question about advantages. Those might be keeping bacteria and infections down, however, I have always kept my babies ears very clean and you just wanna be sure to blow dry them on low cool or low warm so that there is no moisture left after a bath which might be a breeding ground for yeast infection. I never had any problem with Muffin's ears in all of her life and knock on wood I haven't had any problem with little Kacee so far.
