Scam, plain and simple. A web search will reveal many hits.
This company (among others) regularly reviews new copyright registrations (which are matters of public record, available for anyone to see), and then solicits the copyright holder with an offer to include the work(s) in some compilation or other such - for a "screening fee" of about $400-$450 USD. Numerous reports indicate clearly that no product will even be manufactured nor sold - the work(s) will simply appear on a "compilation list", thereby legally (and literally) satisfying the promise. The prey is obviously hungry (and unwary) artists.
Sad, really. 30f6202