Yup, that's precisely the reason why I only solve people's problems (I love being the helpful techie that solves problems when he is able to, don't ask why, it's like a curse), and I never install anything new on their machines.
For example, if I install them a new game, they will come and ask for gameplay directions. If I install PowerDirector, they will complain why it's can't do that X thing Finalcut Pro does.
I also never forget to tell them what was wrong, and how it was app-specific, and what I did to solve it (in plain english)
Offering to build a computer for someone or offering to help them switch to a new OS is like signing your own death sentence.
I can't understand how those linux evangelists sleep at nights, knowing how many people they have dragged into the linux gullag.
I mean come to the OTHER side for a moment: How many times a linux retard installed Ubuntu to someone's computer to "fix" a windows issue, or some idiot destroyed a perfectly good Windows installation to fix a minor issue, installing a truckload of junk in the process. Once this thing happens once, the user becomes suspicious for the rest of their lives.