With groups of ten you cannot buy the preboarding thing. This is MY first time on SW. I prefer other airlines. However, my husband chose this as he has gift certificates to use before they expire. So when you say you can't imagine why on earth someone wouldnt but a preboarding ticket, well that's why, we cant. It's not like I enjoy some epic vacation tainted by a mad dash for seats. Good grief. I just can't imagine adults who would want to be responsible for my child in the event airmasks drop or something else. Furthermore I wouldn't want to be accused of something either being next to someone else child by themselves. I cant imagine people not checking the entire flight on their kid.
I called SW and talked to the agents and both of them said one adult per child under 5 can board. So that's two of us, plus two small kids. I told them about this thread as well and she assured me most people in general wouldn't want to sit by kids, to which I thanked her. My kids are so well behaved that each flight we are always complimented on it. However, that in part is because my husband and I are diligent in making sure their comfort needs are met and that they are being mindful of those around them. I certainly hope they are able to handle themselves alone, but more over I hope the adults mind their own selves as well.