Because it's your money? I know BitcoinTalk is generally against using web wallets, and for good reason considering the security risks present with a lot of them, but hosting your own wallet is only more secure if you actually know what you're doing with it. If you're not comfortable using Bitcoin Core there are a plethora of web wallets out there. Of course that would require some amount of calculated risk and that's for "computer nerds". I'm personally a big Bitcoin user but I wouldn't go recommending Bitcoin to someone who wasn't willing to put in the time to learn how to use it. Bitcoin is, after all, still considered in beta.