Dooglus. That 3.6m total wagered is an impressive number. It might be more impressive PR-wise to put a US$ equivalent of it in the top right. Ticking over like the US debt clock

it could attract media attention.
It does not make any sense to convert all btc wagered at current btc/usd price. If btc price double up, the amount wagered (in usd) should not change.
It would make sense to take the current btc/usd price of every bets, and make a cumulative number.
But it would be very difficult, and I am not sure that it will be possible to calculate it for past bets.