A Cat I ILS to mins isn't exactly rocket surgery. It'll get your blood pumping if something else is wrong, too, but let's remember that these things are engineered so that Billy Bob Bonanza Pilot is likely to arrive alive. And hundreds of dudes do them every day. Let's figure you count yourself as an "average" pilot. 49% of pilots are worse than you, by definition, and they very rarely crash trying to shoot an ILS without some fairly serious "issues" outside of the weather.
As far as pistons...at its peak, FLX had over 100 pilots. Figure on average they were doing at least a couple of approaches a week, and I can personally verify that a fair number of them were at or close to minimums. I'm not aware of any accidents at FLX that happened simply because somebody couldn't fly an ILS to mins OR had an engine failure in IMC. And a lot of these guys, by the nature of the business, were not exactly what you'd call "salty". The bottom half of the seniority list was a revolving door. The FARs are very conservative. That's a GOOD thing, but it also means that unless you bribed your IR DPE, you, too, can DO EEEEET!
Obviously, there are other factors to consider. If it's 100 and a quarter at Green Plains Regional, odds are you're going to get in. If it's right at mins at Aspen and you're flying a jet, don't bother. But for the average guy flying the average piston in a relatively un-scary area that isn't experiencing Thundersnow and Tornadoes, "personal mins" seem less like a real "safety issue" than a lack of personal confidence in one's own abilities. Which is fine...it even shows good Judgment, in a certain light. I guess I'd say, though, that if, as an instrument rated pilot, you don't feel confident enough to fly a cat 1 to mins, you should seek out training until you do. *shrug*
