"Hey guys, I've got a spare Coinbase Pro invite that I never ended up using. I'd rather get some BTC out of it than let it collect dust. If you're interested, shoot me a PM and we can discuss terms."
"Dude, you're killing it with the Coinbase invites! I might be interested in buying one, what's the cheapest option you're offering? What's the condition of the account, is it still active?"
"Nah, I got an unused Pro invite left over from a friend, but I'm good on Coinbase for now. How many email accounts you got to sell and what's the payout looking like?"
"Dude, you gotta be careful with these types of offers. I've seen some shady stuff going on in the past, and it's usually a phishing scam or a bait for a paid service. What's the real catch with the free Coinbase Pro invite?"