First of all, you did the right thing by asking here in these forums.
Second, run.
run.
RUN from this "opportunity". Anytime you have a site that was created recently that has misinformation, or a lack of information on it, it was done unprofessionally, and obviously launched before any kind of QA was done on it. This
screams "scam"; it was enough for YOU to question it.
Always go with your gut. Offers that are "too good to be true" generally are, especially when it comes to online transactions.
If you really are considering this, don't dismiss the option of using an escrow. There are many here on the forums that are extremely reputable. If he doesn't even entertain the thought of using an escrow, walk away from the deal. Sorry, man, but anyone that won't consider an escrow for 50% of 100
BTC ($91,145 at the time of this post) is a fucking criminal in my book. There's a reason why escrows are STILL widely used to this day. Until you can comfortably engage the seller in a trusting relationship after several deals, you shouldn't even think about the possibility of not employing an escrow service.
If it was THESE forums that the user reached out to you on, check his reputation here. Do a search for his name. If there aren't any results, my best advice is to tell you to walk away.
Either way, this forum can be your biggest asset, and be weary of the following masses of sig spammers that are going to tell you that he's a scammer and to walk away, or relay the same repetitive information over and over again lol
Always follow your gut, but just know this, moving forward: it is extremely simple to get fucked in cryptocurrency. Transactions are pretty much final, and although you may be protected by your fiat currency institution (bank or credit card company), once he uses that currency to buy bitcoins, you're fucked.
Takeaway from this post? If you're seriously considering this deal, then seriously consider using an escrow service, and kill the deal immediately if he won't entertain the thought of it. The minuscule (or non-existent) fees of the escrows are NOTHING compared to the risk of getting royally fucked.
Read here for more information about escrow services offered on Bitcointalk:
https://bitcointalksearch.org/topic/bitcointalk-escrows-trade-safely-855778I believe the Big 3 are all still active, but that post may be a bit outdated. @Zazarb is another extremely reputable escrow here on the forums, along with the Big 3:
(Reputation Thread)
https://bitcointalksearch.org/topic/zazarbs-reputation-threads-831382(Zazarb's profile)
https://bitcointalksearch.org/user/zazarb-369212