Could be HF only gets them is their is overstock of parts or commitments to subs they had to make good on.
Also the possibility HF gets parts that don't quite pass the manufacturer QA.
I wouldn't buy a compressor at HF. The only electric stuff I buy from them is because it costs so little, I throw it away when it quits and don't care.
Some things haven't lasted well at all and some have done pretty well.