@SperanzaWilde From experience, most people who say outright that ghosts don't exist, tend to be from lower socio-economic and non-tertiary educated. Their closed mind matches their lack of education. Those that believe or are open to believe tend to be, from what I've experienced, read and heard, to be university educated, often with a Masters (I know 2 with PHDs).
That's a lovely theory and one about which you seem terribly exercised but I have four degrees, one of them a DPhil, and am a senior academic, and doctorates are pretty usual in my circles. 
Also a considerable body of research suggests you are entirely misguided about the relationship between social class, education and belief in the supernatural.
See Goldstein (2007), Shtulman (2008), Schwadel (2012), Baker (2018) for specifics, but in fact all the research says much the same -- that the more educated a population is, and the higher their social status (ie class and income), the less likely they are to hold supernatural beliefs. Obviously there are variables in gender, age, ethnicity, but broadly, the research says that the more secure and well-established you are in the world, the less likely you are to 'believe'.
Empirically, look at the average audience for Sally Matthews, or the people who bought Doris Stokes books -- that's overwhelmingly a working-class and lower-middle-class audience.