I presume their profession shape their personality. Personally i dont know any but from what i learned about them is theyre very harsh and merciless...
It is human to value what is most difficult to achieve, we must add the fact that this person supposedly has other better and more exciting options....
There is truth in that. IMO it has to do with fear of rejection. As others mentioned, women take rejection harder than men. Flirting with gays or men...