Most hatchlings will not start on F/T, and plenty of babies refuse their first meal (no matter what it is) and go on to be great eaters. I don't know how long you've had the bee, but if it's only been one meal, I wouldn't panic yet. That being said, if you plan on breeding, you will probably not be able to completely avoid feeding live, at least for new hatchlings.

As for the trade, that is really just a personal decision. Just make sure you disclose that the bee isn't eating.