Mmm and now for the harder questions

:
-Don't you live in constant fear that a book that has been rejected by you will become a huge hit published somewhere else

?
(maybe this next question is also a part of your answer)
-Should an author be careful on what publisher (s)he submits his/her work to?
Or should a writer just think; the more submissions, the better the chance on getting published?
-And finally; how is your view on a new novel by the same author from last year? Have you known many writers who succeed after a few years to surprise you and get published in the end, while their initial submissions where awful?