The thing for me is this...I honestly have no problems whatsoever about her using the show to improve hers and her family's financial position in life - so long as the kids aren't harmed, of course.
What I do have a problem with is how she has treated people along the way. It's one thing to be ambitious and motivated, but another to treat people like doormats. That is my only and biggest beef with Kate (again, assuming the kids are well cared for).
And, for me, Kate has zero personality. I do not find her entertaining or engaging. In addition to being a you-know-what, she's a snooze fest. Yuck on all counts.