Your welcome and thank you. Yeah at a certain point comments are collapsed. I think sometimes it is because of how deep they are nested and others from not having enough upvotes.

Here is an example where the most indented comment is 10 levels deep. The comments are color coded for the indent level. It goes no color, red, orange, yellow, green, blue, indigo, purple and then starts repeating at red, orange, etc. The colors really help keep track of the indent level in massive threads.