In fact, now I've sat here and thought about the subject a little more, maybe this description will help you see the point these guys are trying to make a little clearer.
I'm most definitely a novice, but this is the way I have interpreted the information I've read from Laura's works & others. I've just tried to break it down into language I can understand, and thought you may benefit also?
So here goes:
As we can see from reading Laura's material, in order to communicate successfully with the C's, (and most probably any STO orientated/polarized consciousness out there,) you need to have 'grooved a channel' so to speak.
Now, Laura didn't just start to groove the channel the first time she sat down at a Ouija board - her entire life up to that point was spent grooving that channel. Everything that happened to her (paranormal or not?) was designed to assist her in grooving that channel, so that the day she did finally make the move to experiment with the board, it was a much easier process for her to 'tune in'. (Apologies on the choice of terms - this is all written from a novices point of view!)
Now Dancing Duck; the likes of you & I, who have never had any paranormal experiences so to speak of, have definitely not grooved a channel. And I think the hub of the matter is that you wont groove a channel by just sitting at the board - the grooving comes through a lifes work.
So, when these guys are asking you what your motives are, what they are really asking is this: If in all probability you will only be communicating with entities of the STS orientation (due to your lack of experience etc), then why would you want to do so? Whats the gain .. to your own growth?
Hope this helps. I've re-read it three times but I know as soon as I post it i'll find something I'm not happy with lol.
Now i will most definitely bow out & leave the experts to continue posting.