people are willing to pay that plus amount in those cases
yeah this is just because of lack of competition in this market. for example in my country there are a handful (like 20 or so) of traders on localbitcoin and private websites who exchange bitcoin to local currency and out of that there is only a couple of them who can be trusted.
so we all have to accept their high asking price and low bids for our exchange to fiat!
If you sell your bitcoins in localbitcoins means We will loose nearly 10 percent of the profit. Better try to get a Bitcoin debit card. I have personally Advcash card. They are charging 2% only as a charge. Its pretty good right! If you wish just try for it.