Are you more likely, or less likely, to comment on an entry that already has a lot of comments?

Depends on the entry, the comments, my mood and the amount of time I have available. Contrary to the way things work in the Poll Universe, my reactions don't tend to be either-or, is-it-this-or-is-it-that. Rather, they're based on the interaction of a number of variables, as well as a certain degree of chance.

"Now we come to ticks and tocks lj-cuts. Do you commonly click on lj-cuts?" "and links?"

Same as above; many factors interrelated. You could have made this explanation- process much easier if you'd put ticky-boxes instead of radio buttons on your poll; "click all that apply" rather than "choose just one".

"You yourself use cut tags for which of the following?"

How come you've got "never" listed as an option, but you don't have "always"? I always use lj-cuts on my own journal, and almost always on communities.

"What do you think about crossposting?"

Depends on the nature of the post, the nature of the communities, and the nature of the relationships between the members of the communities.

"Quack?"

Cthulhu ftaghn!