I remember one 'study' my Mum had - a pee-soaked old lady living on her own who wanted to go to the KH on a Sunday - she just wanted company really, and not much to offer in return.
Then there was the town tramp - the eccentric one with pots of money - living in filth but with a working grasp of ancient Bible languages and half of Russell's works under his bed.
Oh yes - that reminds me of the immigrant mother of 5 that spoke next to know English and was sub-normal intelligence.....etc etc
And that was just my Mum calling on that lot - multiply that by 100,000 JW's in the UK over a 20 year period and see how many misfits you can recruit.....
Most JW's will be frank and admit that there is almost zero probability of recruiting anybody older than 25 that is of normal or greater intelligence that has a family, career etc.