Why are so many Plastic surgeons asking potential clients to pay for their consultation?

Hi, could someone please explain why so many surgeons are now asking that clients pay for their consultations because I wanted to see several surgeons before deciding who to go with but if I saw say 7, that'd be around £700 before any date was booked for surgery, then there's the journey to pay for & time off. I feel they do it to tie you to them only, why are they doing it? United Kingdom

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