Hi Vivian,
Got here before Seeker, so hope you don't me answering

What you say is probably true - that a majority of people do not turn to the Lord unless they have selfish motives (though I'm not sure abt the accuracy of your percentage!).
Human beings have weak natures and are prone to be selfish. This, trust me, is no surprise to the Lord. He probably - & this is my opinion - allows us to have areas to "need" Him, i.e. He allows us to get sick, fail in our finances, rock our marriages etc because He knows that we won't turn to Him unless we really are in need of help.
However once we have turned to Him, He also empowers us with the Holy Spirit's Power to become Selfless, like Jesus was. To become a servant. To seek God's will & the good of neighbour as of ourselves.
Let's face facts, without God, we will be selfish & a whole lot of other horrible things. If the retreats bring people to God & then win them over to Him, even at the point of forgetting one's selfish motives (see my examples following) then the original purpose of attending the retreat doesn't matter.
2 Examples:(01) Deepa (name changed), a girl who did a retreat with me about 3 years ago, was a very beautiful and non Christian girl, who came to Tabor for the sole purpose of getting a job as a Flight Attendant in an international airline. Besides Tabor, she had also "tried her luck" with several other "gods" at other places.
When at the retreat, the priest got a specific word of knowledge about Deepa & called her on stage. He then told her (personall, off the mic) all what she had to do briefly: She had to stop praying to get a job & instead surrender her life to Jesus. Since she was staying my room, she shared all these things with me.
She told me she absolutely could not stop praying for this job, it was all she ever wanted to do since she was a young girl. I counselled her as best I could & offered prayers for her the rest of the retreat.
God managed the impossible – He completely managed to change her mind about the job & she was able to surrender her life to Jesus.
Deepa continued to call & talk to me for weeks after the retreat; she often found it difficult to live without the dream that she had cherished for so long, but she was trying. Eventually I stopped hearing from her.
I was happily surprised one day, when she came back to Tabor & shared how she had suddenly got a job in an international airline (exactly like she wanted) without even praying for it. Now she had Jesus and the job.
(02) My second example if of T. D. Joseph, posted at the website at:
http://www.glorify-god.com/testimonies/joseph.htmlHe was in great financial crisis when he came to the Lord (or rather when the Lord pulled him to Himself).
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Remember,
coming to the Lord (whatever the motive may be) is a GOOD THING. Don't forget that there are many other roads people can and do unfortunately take when faced with problems. But on coming to the Lord, a person’s life can be completely changed. Or at the very least, a seed will be planted for the future.
If you feel 'nagged' by this, I suggest you
pray that everyone who attends any retreats for any motive whatsoever, is touched by the Holy Spirit into developing a personal relationship with Jesus and thereby transformed day by day into His image..
Blessings,
Melody