The snag is that loads of people for certain genres - typically anything that uses the word 'beats' is going to have packages of bits and pieces. It's how that kind of music is produced. Little building blocks - which can be self-produced, recorded as a new product in a studio specifically for the track, or track 8324 off a ten thousand clip expensive package. You have the percussion, the bass and then the other stuff - so grabbing 20 separate tracks and copying and pasting is sort of 'unique' - as it that combination of stock clips is new. Big names do this as much as newbies, but I guess you are paying for their knowledge of their library - finding exactly the bass sound, or that weird snare to suit your track. Facebook and social media as a whole are, for some types of music, now almost essential ways to market the music - so a FB presence is critical I would have thought. Doesn't need to be the private real you of course, the artiste FB is usually different.
The people who produce the beats are just different from the people who use them normally. If all you need is the vocal - there's no reason you can't do it all yourself on a decent spec laptop - BUT - you need decent monitoring if the music is to sound like it will in the venues it is played in.