From my experience, I think that low rep (say, <20, and particularly newcomers with rep=1) are much more likely not to provide feedback on whatever help (comments, answers) is provided. This is either by not replying at all, or by not reasonably following a thread (not posting needed info, etc.)

That has two consequences, in my view:

1. Not being able to follow-up on a solution.
2. Discouraging helping in questions from askers with low rep, based on a increased expectation of the above.

So my two questions are:

1. Do others have the same impression?
2. Is there any way to measure the distribution of "feedback rate" vs. rep, to confirm or reject this hypothesis?
   I understand a confirmation of the hypothesis might be a double edged sword, as it may improve the overall quality of Ask Ubuntu (drive more productive interactions, and a cleaner database of Q&A), but it might discourage others answering to low rep askers... I don't know which would prevail.