It sounds more like the person you helped buying Bitcoin wasn't well informed, which was your job to begin with if you acted as a guide. Don't blame Bitcoin's network for that.
If it concerns a trade (which generally is considered a priority transaction), include an above average fee to make sure it's almost "guaranteed" to be put in the next block. I do so too and it works like a charm. 9 out of 10 transactions that I send are included in the next block.
Something must be done to inform people on how to use a decentralized ledger, because it works perfect for me.
I have created a paper purse, also create an account in blockchain.info
Now I want to buy a bitcoin in person localbitcoin.com and tell that person that I sent it to my paper Wallet
How could I use the accounting book to make sure I made this transaction correctly