Gosh well, nineflowers. My dh is a CofE vicar.
That's it. We just all want your money 
Really, though. I'm sorry you've had that experience, and I've no doubt that there is something of this going on - as I keep saying, we all get it wrong.
However, my contention about caring for the vulnerable is that we are called to care for the vulnerable. Whether they come to church or not, whether they are interested or not. We seek justice for the poor and needy because they are poor and needy and because we believe everyone has value and worth and everyone deserves to be cared for.
If vulnerable people often appear to 'be suckered in' then that may be because they have finally found something that gives them life, that fills that great yawning need, that transforms their life and often their circumstances. Surely part of being a Christian is to tell others - should we not tell people who are mentally ill in case it is seen to be 'jumping on the vulnerable?' - even if we believe it could make for something amazing and wonderful in their lives?
It's not about money. Money gets in the way sometimes, particularly with these old money pit buildings, so can appear to come down to that at times. But for those truly seeking to follow Jesus it's so not about money you couldn't even go there. It's about freedom. Pure and simple :)