I first realised the site from a profile on be2.hk which is no doubt a clean normal operating site in the region. It tries to re-direct any member on be2 to Birdhi.com.
In order to reply the greetings from the lads, one has to upgrade membership in the rates that 38 USD for a month, 96USD for 3 months, 168 for half year, 288 for a year.
While after the 1st week with overwhelming greeting mails internally, they all went offline in the coming weeks. And their online hours seems to have a regular pattern from 9 to 5. They might not intentionally went offlines after the 1st week, but they have to take care of the other new member (due to limited hands) they turned 'invisible' to you.