What you're describing is a phenomenon of digital information. The first copy is the most expensive due to the high fixed costs in creating the content. All subsequent copies are virtually free. The marginal cost for Microsoft to print another Windows 7 DVD is virtually zero; the same for Def Jam to print another copy of God Forgives, I don't. The same can be said for any content, particularly in the music industry.
The original and first production of Lex Luger's trap sound was probably very costly for Lex. He had create the perfect snap for his snare, the triplets and rolls for the snares, the way his 808s knock, even his signature sound fx pitch up effect. He had to basically forge the entire sound himself. Once the "sound" was established in the industry, everyone else could simply sample his snare, recreate every effect he had due to the availability of broadband and the massive access to information (people on forums discussing what patches are used in what songs). So every producer was able to basically knock off his sound for free; thus shooting up supply of Lex Luger type beats in the industry, and driving prices down for what producer's could get reimbursed for the music.
The phenomenon will get worse and worse for content creators. Although, they will be able to produce more content with less costs, the supply will shoot through the roof and drive prices further and further down. Eventually, only a few people will be able to earn money in the industry.
