Guy coming to this forum, looking to buy half a million dollars worth of BTC in cash? Face to face? Will pay for your travel and all that? Oh you're going to be so in for a world of hurt. Can't see many ways you could get out of this even alive. It's probably a lot easier buying from ATMs 100 times (5k Euro limit I'm thinking off for most ATMs, he could visit all these ATMs in a spree of a week and get it done). If you are genuine though OP, as others say, go to localbitcoins. SO many face-to-face deals waiting for you, these guys ONLY to physical trades.
Would love to be a fly on the wall for such a trade.
Yeah, it's really strange whar kind of ideas people have. Whether this guy is serious or not he puts himself in ackward situation, probably also potentialy dangerous without even being aware of that. Sometimes I can't tell if people are just reckless or really don't have the clue how such business should be done.