Just to answer the title question, I don’t think that bong is worth $300. I spent $150 Canadian on mine 15 years ago and it’s still a good daily.
That’s my opinion.
But I use rolling papers, spoon pipes, Sherlock’s, Gandalf’s, Beakers, bubblers, table and pen Vapes. My table vape was the most expensive at $220 Canadian.
I am mid 30’s, believe in karma, appreciate good smoking devices, but couldn’t be drugged and beaten into paying $300 for a bong like the OP posted. I am more than happy with someone else supporting local glass though!