It's also because most men believe that they have no chance with a 9 or a 10. Why bother messaging someone who they believe is vastly out of their league?
Some men are great at hacking the system and ignoring a woman's physical attractiveness, thus scoring really desirable mates. Others instead implicitly follow the rules of thumb that psychology discovered a while ago, according to which an attractive person is much more likely to be with another attractive person.
Most men stop contacting the most attractive female profiles because they never hear back, and the effort required to make a message that stands out - i.e. is original and interesting - does not justify the very low chance that there will be any response.
This might be the case sometimes; in this case the best-looking one isn't in the unattainably-beautiful class though. Her nose is kinda big.
In this case I think it just indicates that the initial judges did a poor job of judging who the most attractive one was. Or perhaps that the black and white picture used by the most attractive woman is a turn-off.
As for the "most attractive" man, he has a nice smile and nice eyes but his baldness and undefinable ethnicity might be a turnoff for the average woman.
I think the judges probably voted by looking at actual pictures, where most male selection probably happens at the thumbnail level. I'd argue the second best has a thumbnail that would garner more attention, from color if nothing else.
Most men stop contacting the most attractive female profiles because they never hear back.