I bought a used Macbook Pro for ~$300 worth of bitcoins a couple of years ago. those bitcoins are worth ~$20K. My argument for why he should accept the deal was

I bought a used Macbook Pro for ~$300 worth of bitcoins a couple of years ago. those bitcoins are worth ~$20K. My argument for why he should accept the deal was, "they will probably go up in value". I'm happy I did it.