Anyone that believes someone can contact the dead really needs to learn critical analysis.
A- There is no afterlife -
(for those that reply with 'but you can't prove there is no afterlife, that's just your opinion bla bla bla" crack, I can't prove there aren't giant toads living above the clouds that make it rain when they piss either, but my critical analytical skills tell me thats highly unlikely, given the scientific knowledge we now have)
B-On the the tiny off chance I was wrong and there is an afterlife, why would loved ones chose to speak to strangers, knowing their family are in turmoil wondering if they suffered etc... Why not go straight to the family member and let them know!
C- Again, if it were all true, how can the spirit world also see the future? It's one thing to be able to 'contact' the spirit world and the spirit give info on past events - but being able to also see the future? Wow that's some accolade
that...
D-People love attention.
E-People love money and there are charlatans in every aspect of service and those that will rip you off and prey on your vulnerability. This is no different.
F- For those that still proclaim that it's genuine, they are deluded.