Not sure about you guys, but the domain name itself sounds too shady to start with in my opinion.
Pretty common domain for scammers to use. If you see domains like; btcprofitsdirect, btctraderpro, btcwalletsafe, etc it's 99% likely to be a scam.
http://whois.domaintools.com/btcbuyerseller.comDomain is registered like 6 months ago and only for a year, of which 6 months are left, which isn't a good sign either. Serious businesses register their domain for at least a couple of years, and they will pick a short and brandable domain that looks professional.
That's what it pretty much looks like. Though apparently this specific service had a different approach. Become a legit service for months with people trusting it, and bail when probably enough bitcoin are trusted onto the platform. In contrast to the typical "screw you, my coins now" at the moment of deposit.