Each beardie has a different personality, the more expensive beardies wont be more aggressive for no reason at all compared to non expensive ones, some beardies expensive or not will have a more defensive personality compared to other beardies.
He's most likely just freaked out and a bit scared of you as he does not know if you will hurt him or not, and this is perfectly normal for them to act this way when they don't know you.
I have a wiblits beardie named Neptune, she was around 300 and she is the sweetest beardie I have.
(Towards humans at least)
Though she is a bit special in the head, and is more of a one person type of beardie but this has nothing to do with her morph.
When she was younger she had a phobia of hides (still does but not as much),
she tries to eat temperature gauges on occasion (usually the zoomed yellow ones),
she only just learned a few weeks ago she wont die if she jumps off her hammock down to her rock bridge which is literally an inch a way where she can get down from,
she freaks out pretty badly when someone else that isn't a family member touches her or picks her up,
She is also extremely aggressive towards other beardies, towards humans that aren't strangers she's pretty sweet and never has one sign of aggression. However as soon as she sees another beardie she will try to kill it if it does not leave her enclosures area. If I have all the beardies out I have to keep her at least 4 feet from the other two at minimum.
(I rarely have them out all together, and when I do have more than one out it's usually the two adults)
She's also literally smaller and younger than my two adults and a bit weaker than them but it doesn't seem to really come into her mind that she would probably die if she fought them at all.
Yours will eventually come around it just takes time.