I don't like to receive amps from head-fi members for review, for two reasons:
1. I can't predict how long a review will take me, and I don't like tying up someone else's personal property
2. I have no problem writing a negative review where I am send a loaner by the amp's maker - but I once wrote a negative review of an amp that was loaned to me by a member, and that member was mad I didn't like the amp he'd bought, and gave me a super hard time for a long time. Manufacturers know they cannot get away with that behavior - members do not always. So I don't like to review loaners from members precisely BECAUSE it helps to keep the stress level down, and the fun up.
Like I said, I don't see an issue with reviewers when they are upfront and honest about what comes from where, plus of course, their reviews also lend credibility if they cover the whole spectrum of opinion rather than everything reviewed being the best thing since sliced bread like some do on here.
It just smacked of something unsavoury but as you've explained yourself and taken in context with your reviews I can accept that.