These are not dictionary words.
Sour is a dictionary word. Mysour is not.
Aced is a dictionary word. Myaced is not.
Ayoin is not a dictionary word.
MySour has a small shot at selling. If someone was going to name their company Sour, and sour.com is taken, then MySour.com is a nice alternative. Problem is that sour has a negative meaning (usually) and there aren't too many companies calling themselves "Sour." Put a $2500 BIN on it and see what happens.
MyAced is not grammatically correct, but the same applies. Doesn't look like a lot of companies call themselves "Aced" so that's not good for the value. Ace, on the other hand, is hugely popular.
Ayoin is just a made up word. $1-3K Brandbucket / Squadhelp play. It's awkward to say out loud. There are probably a million better alternatives in that price range. Odds of selling it basically come down to luck.