There *have* been quite a lot of stars in various fields, mostly young prodigies, many of them managed by relatives, who found themselves milked for every dollar they were worth but given almost nothing -- a disaster if your career is as a figure skater, tennis player, or similar, who can't expect a professional life past 30 or so and needs to be planning to live off the proceeds for a long time to come. Also happens to composers and authors who are told to sell their work outright while the agent negotiates ongoing royalties for himself.
Sorry if this looks like a threadjacking... to return to my basic point, I don't see anything inherently bad about pimping - just that it is a business that experiences an incredibly high corruption rate. Mostly because of it being illegal. Legalizing prostitution doesn't make pimps vanish necessarily -- it just makes them subject to business regulations, sue-able for failure to give the girl her share, etc., and would generally force them to reform. Much the same way as prescription narcotics are safer than street drugs, not because they are less addictive or dangerous inherently, but because they are quality controlled in production and (sometimes anyway) distributed according to medical need instead of desires.