Hi Danny - Any amount is worth sending as long as it is above the postage I guess. They give you 94 % of the day's spot price - the day they open it up and weigh it. And you know that 14 K is a little more than 1/2 purity - for example. 24 karat would bring the total spot price minus the 6 %. I have never had any problems and a bunch of guys on the surf forums like them as well. If an article that you send does not test out as gold then they send a pic of it and if you want it back you pay postage. The few things that I have sent that were not gold were not worth keeping.
Since my last post on sending it I have sent some more - my last 2 1/2 years gold / silver finds, lots of silver this time. Got about 400 bux.
Good luck, Steve in so az