One reason why someone won't pay $2500 per 1.45 TH is because bitmaintech.com completely beats that pricing.
Antminer S3 sells for 0.725 BTC. Each are 478GH Per unit.
366/478=0.766W/GH They are more power efficient then your units and way cheaper.
For $2500, 2500/630=3.968 BTC.
With that I could order 5 Units and keep 10% of BTC, for math sakes, 5.47 Units in total would yield
5.47*478=2,614.66 GH.
2500/2614.66=0.956GH/USD
95.6 Cents per GH for Bitmain.
VS
2500/1450= 1.724GH/USD
172 Cents Per GH for yours.
Also 5% more power efficient.
Market pricing for your unit is around 95.6 Cents per GH, at 1450GH, your unit at most should be $1,386.2 or 2.2 BTC.
Anything over that and anyone will prefer to buy from bitmaintech, or from china, instead from here.