Well, yes, it is very easy to do, but some people are really afraid of computers, and don't find anything about it easy.  I have a dear friend who is so afraid to do anything with her computer, it's amazing!  She's not even old!  But I guess we've always been eggheads in my family, but not in her's.

However, there are MN management services.  The biggest one now is Node40, but also some of the developers and forum members like flair provide services.  You don't even have to risk your coins if you have the entire 1000 coins available.  You just give them the masternode private key, which can't be used to access your funds, only verify your node exists.  That and the transaction id for the deposit of the 1000 coins into your account and the index number in that particular block.  With that, they'll run your masternode.  You do pay for the service, but it includes servicing on a VPS as well as management, updating and making sure it's running and nothing is going wrong. 

So really, there is no reason not to invest in a masternode unless you can't afford the coins.  There are even services that group coins together from share holders and run nodes for them.  In this case, you have to trust them with your coins.  But you do get to participate in earning dividends on your coins, even if you don't have enough for a masternode.