Hi fairlay,
I sent a PM the other day but haven't heard back, so am trying in this thread.

Whenever I accept large offers in the sports market, there is an immediate reaction at other large sites such as matchbook or pinnacle.  It seems most of the offers are just an intermediary to betting on those sites.  If pinnacle offers 1000usd, your site offers 2.4 btc.  If I place a bet for 2.4 btc, the price immediately moves on pinnacle.

Is this how your site is set up to operate?