So from what I have gathered is this- 1. I should avoid buying an old handle as there is no good escrow that I can use to purchase it.
You should really avoid buying without escrow. It is very hard to purchase an account with the guarantee of a decent post quality if you don't use an escrow. I can be the escrow if you want to, as long as you can accept some of my conditions.
2. I can have multiple accounts, just should not participate in the same Sign Campaigns with these multiple accounts.
Yes.
3. As far as I am not spamming the threads using multiple accounts and actually posting relevant posts I should have nothing to worry about. Please correct me if I am wrong.
Honestly, most of the community (including me) actually condone the trading of account. Some will specifically tag it so as to notify others.
I personally do not condone the trading of accounts since most of them are eventually used for scams or spamming. Rather than purchasing an account, I would just advise you to build your account from the start. You can learn a lot more this way and can contribute effectively in the future.