I mean, to be fair, "amateur" doesn't necessarily mean less talented. It just means that they don't get paid for their work. SO in this case, building sandcastles is a hobby he's very good at, but he's not a professional because he isn't paid for it, because it isn't his profession.
Can you imagine if you spent a bunch if time on a very intricate sand castle and someone just jumped on it like in that vacation video on the Rhett and Link YouTube channel
me
*cancels all carreer plans*