Business Visa - B1

Hi, I hope this is an encouragement for those genuine people who've had their visas rejected. I work for a church and have been invited since 2003 to attend conferences / meetings by other churches in the US that are connected to us. Was refused in 2003 to attend a conference (1st time), reapplied in a couple of months time and refused again (2nd time) In June 2007(after 3 years)applied with my family to visit my sister's family on a holiday. Was refused (3rd time). In Aug 2007 applied again (for a conference) and was rejected (4th time). Applied on April 4th 2008,(5th attempt) with very low confidence...(also note: applying 3rd time within the last 12 months)and was granted a 10 year multiple entry visa! In all my earlier interviews VO only looked at Invitation letter (no other docs) and asked standard questions for 2 mins.They would also ask me about my brother and sister who are H1B and Green card respectively...I guessed this was one thing that went against me. Was the same this time, only difference was VO flipped through my passport (have been to 5 other countries) and granted the visa. Thank God!