This has been discussed adnauseum. You aren't the first one to think this is just an oh so simple fix. It is not. Just because you personally don't have a valid use for locked and self moderated topics doesn't mean they should be removed. Its like saying well since I own a car we don't need sidewalks because I can drive everywhere, and fuck everyone who walks or rides a bike. I don't know if you noticed, but this place is full of trolls and the mods are not always snappy to take action (if they even care to). Self moderated and locked topics serve the purpose of allowing people to have simple sales threads uninterrupted by trolls and bored morons.

One common example is any time you list a gift card, even at cost, there are always 100 cunts demanding you sell it under cost because there are 500 people selling stolen gift cards and they think that is the going rate. This is just one example. These features were put there for a reason. You need to find another solution to these issues other than just stripping features one by one because you personally don't find them useful.