I don't know. I think people are pretty honest. I guess it depends if the contact you receive is personalized or mass spam. I got a personal email from my program director telling me he was going to rank me highly. I also received some phone calls from other PDs. One PD hand wrote a page letter. Literally a page. I doubt they'd do this kind of stuff unless they were serious.
I wrote an email of interest to one PD. He said "Sorry. Not likely. However, anything can happen on match day. Good luck." Lolz