HOw scammy does this sound?

BTC-e offered me a first time buyer offer whereby I sent them 8btc to an address on the promise of getting 10btc back for helping to improve traffic.
I was talking via sykpe to "btc-e.support @ europe" and sent the coin last Weds (5 days ago).
I checked my address at the time on blockchain but there was no confirmations there, it's only just occurred to me this might be a scam

Have I been complete tool? Has anyone else experienced this offer/heard of anyone else having done so?

Man I feel sick...