Having grown up in a church that preaches the rapture and having friends that sold everything (home-clothing-business) I think that those that want to preach they know when the end is coming that they stop and read their bible again.  
As GiddyMoon wrote:
'No one knows the day or hour. The angels in heaven don't know, and the Son himself doesn't know. Only the Father knows.' Matthew 24:36
And for those of you with children growing up in similar churches, can I say that I cried myself to sleep many nights because I was so worried I would never get to be an adult, have kids etc.  
Faith and Hope are good things!  But fear and dread is not the way to inspire.  The unfortunate thing in all of this, is other people will have sold all or feel that they were not good enough.  My friends that sold all, ended up being a family of 5 living in a bread truck.