"You can easily identify users with high-rep and post thoughtful comments to get their attention."

Perhaps, but I find that even the most positive of comments rarely get votes from high-reputation authors. They simply do not engage in upvoting those with lower reputations than themselves.

"I've actually been very impressed with high-rep users responsiveness."

Then, congratulations! You are indeed the exception to the rule. As I stated above, it is very rare that higher reputation members will ever upvote those with lower reputations than themselves...very rare indeed. It simply does not happen very often.