It could be that you have been picked out of the cloud by someone willing to invest time and money into making you famous in return for the warm wonderful feeling they get from helping out a promising artist. Or it could be that there is so much money sloshing around the music business that such promoters can make a good living on finders fees from third parties. Or it could be that this is the musical equivalent of the Nigerian prince.
When recording companies were in ascendance it was possible to find promoters who would claim to be able to make you a star in exchange for some up front money to shop your demo, but since the record companies are now spending very little indeed to promote their acts, and signing ever fewer acts to promote, the word is self-promotion. And the people who have the know how to separate artists from their savings in return for services of dubious career benefit are multiplying like rats in a landfill. Be very careful what you are being asked to provide, not just in cash but in rights.