It is a generic word with a consonant added to it....with the m added, the word down is no longer a word in the English language, rather it is an unpronounceable 5 L. Unless I am blind to what the market is for downM I say reg fee or less undeveloped.
I'm going to say no, even take the word as a whole " down mp3" " down mania" "down movie" doesn't mean anything, and it isn't searched for....it is brandable at best and needs to be developed to gain any value.
It had thousands of visitors beause it was a developed website, it did not have 1000's of visitors who were specifically looking for downm . This name needs to be developed to be worth anything. Otherwise it is just another regged 5L among 16 million others.