If according to you , he was a scammer , I think 450 btc is large enough to run away with .
What? You think 450 bitcoin is enough for them to have simply run?
That's only the beginning of the process. Are you new to all this or something?
They've got 450btc to use to keep manipulating the market every time they post the latest plethora of 'impending moooooon' bullshit posts.
They can keep buying it when the price slips and then selling it back to you after they post some crap about impending update while using some of their 450btc to fake some interest in the coin and lift its price up while you panic as the FOMO sets in and you start buying at the new increased price because . . .well, FOMO.