Mind and body are very tightly bound (that is how placebo works) I don't think you are wrong to be wary of speaking disease into existence. The only sinus infection I have ever had, came after reading a particularly vivid and detailed article about how they start. Like my body was following along.
I do give my work computer enrichment activities to keep it happy. Listen to music so that it can have music, browse occasionally so it doesn't have only work to work on. I get far fewer problems than my teammates do, so it seems to work even though it's superstitious nonsense.
I think I believe this too. I have birthed 4 kids. 2 tech wizards, one average, and one who the computer hates. They just don't work for her like they do for me & the average kid. I think the difference between average and the tech girls is interest and effort, but the difference between average and the one who has bad luck with them does not seem to be explainable in the same way. And it's not a creative/logical split either.