Just as a quick update. Robert and I have agreed on a $40 refund sent via Money Order or check once he receives his first paycheck after starting work with his father. He has apologized several times to me, and again, I greatly appreciate it. Once the refund is done, I'll be sure to update this thread. Hopefully Robert and I can walk away from this with more knowledge for future transactions, and we can both grow from this experience. John, you said it well, he's definitely on the right track!
Katie: I've seen you around Pangea for years and I'm sorry this happened to you, I know you're far from new to the trade. $70 seems a fair price for a nice male. I hope the refund comes as promised (unfortunately, a lot of the promised refunds around here of late seem to never materialize.) Please keep us posted. (And is there a reason he's not refunding by Paypal? Also, if you do use a money order, make SURE it's USPS, not Western Union.)
Robert: I'm glad you're doing the right thing and trying to turn this situation around. As you well know by now, your initial reaction was... way off base. But I sincerely wish you the best in trying to (re)build yourself a reputation after this, and I hope you've learned from it. It sounds like you really realize you goofed up and want to fix it. Best of luck.
Here are a few notes/tips that may help you in the crestie world:
1) If you don't own a 30x lighted loupe, buy one. It's the best $12 you will ever spend if you do cresties.
This right here! A loupe like this lets you pick out pores on juvies as young as 6-7 grams. It would absolutely pick out those photographable pores on a 16-20 gram subadult. If you don't loupe sex a crestie, it's best to sell it as "unsexed" unless it has a huge bulge. I would never, EVER sell a crestie as "female" without louping it unless I'd already seen it lay eggs with my own eyes.
2) most breeders (and buyers) consider 20 grams the "magic number" in terms of sexing -- if it's over 20 grams with no pores under magnification, it's considered "guaranteed female", and it's rare enough for a 20+g crestie to develop pores or drop a bulge that nearly all breeders and buyers would expect a partial refund (as you offered) on a mis-sexing of an animal that large. It's in your best interest to sell animals in the 15-20 gram range with no visible pores as "probable females". You'll have to make a lot fewer refunds or exchanges that way.
3) Cresties, the males are more common and less valuable -- the numbers are up for debate, but people cite anything from about 55% male, 45% female, up to about 70% male, 30% female. In any case, males are the vast majority, and unless they're SUPER high end males (like in the $400-600 range), males tend to sell for about 2/3 the price of an equally nice female. (Your friend may have been thinking about gargoyles, who have the opposite gender ratio -- males are the more valuable in that species.)