That's what I've heard by people who claim to be i

That's what I've heard by people who claim to be in the know. I am not in the know. If your shares are in a cash account they cannot borrow them. That means you do not have to set a ridiculous sell price for them. If you have a margin account go ahead and set the high sell price so they cannot borrow your shares.

Yes, if you do not have a margin account you have a cash account.