From 1broker main page
4486 traders already placed 397428 orders.
For a site that has been online for 2+ years 4.5k traders and 400,000 trades sounds quite low.
The site certainly looks nice enough (although that doesn't indicate anything really) but why hasn't it been more popular? There has to be tons of bitcoin enthusiast who would like to trade stocks/index/forex etc. Idk just seems a bit odd