Not just A1s,there are a steady stream of DM7 and ego 7s,I think the market is at saturation with 101 different guns to shoot 15 bps.The other thing is that there are only probably a couple of thousand tournament players around and god knows how many markers in circulation.
The amount of players who seem to be hanging up there boots is also going to compound the problem as even more used gear is chucked onto the boards.