I have a ton of unmigrated minecraft accounts, and I'm in need of bitcoin so I'm selling them 0.012 bitcoin each.
You can change the email, password, name, and skin on all the accounts. (%100 your account, so way for me to take it back after selling you it.)
I'm willing to go first if you have very high rep here, as I am clearly new. I'm also open to giving a mod or extremely trusted person a free account in exchange for a vouch.
If you want to buy an account or ask any questions you may have, feel free to pm me.
You seem pretty legit to me.
However, I'm just pointing out that changing the email and password of an MC account does not make it yours. When I purchased MC many years ago, I was emailed a code stating that if my account was ever lost or stolen, I could give Mojang (creators of MC) the code. Giving them the code would give me the account back, no questions asked.
If you've bought the accounts in bulk, it's unlikely you've got the codes, but you never know...