Barrett Airsoft rifles, whats the deal between the two?

Alright, so as we all know, Socom Gear has come out with their M82A1 Barrett .50 cal sniper for $1200. BUT, The Model 99 Rifle (Non-liscenced by Barrett) sells for 189$ and IS a Barrett rifle, just without the trademarks and logo. So what makes the M82A1 sell for so much more than the M99? Remember these rifle are both full metal and yes the M82A1 IS an AEG but the AEG form isnt worth 1000$ more.