Does somebody see any legitimate reason to avoid low reputation accounts to comment OP's question ?
I personally don't see any problem if StackExchange allows already low rep accounts to post answers.
It can get absolutely counter productive when it comes to the situation where a low rep account has the opportunity to bring something really constructive to the conversation and can't do it another way than by posting an answer, knowing he may probably and unfairly get sanctioned for this... as it happened to me recently.
This situation also doesn't really welcome new contributors, and make them very inclined to run away from Stack forums, which is a lose for everybody...