Why using exe compressors?

[Cowsheep]

Why the trainer scene is using exe compressors so often?
I dont see any positive effects.
- Files are packed with Winrar or similiar, so smaller exe does not matter for downloading or hosting the file
- The 100 or 200kb smaller exe on disc does not matter with hdd sizes of 500 GB or more
- Exe compressors are causing often Antivirus false positives
- They can be easily unpacked, so no protection from analyses by others