"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.
Ok, maybe "easily" was a bit of an overstatement.
It's a roll-of-the-dice, but your odds are way better than any casino.