As mentioned below, anything wearing in your engine not already caught by the filter (unlikely assumption to begin with) isn't magnetic. IF you are getting metal sticking to a magnet, there's a big problem.
I've seen a few engines where people use those magnetic drainplugs but there's never any metal filings (or anything) sticking to them.

Just change your oil and filter frequently (unlike most) and your engine will easily last as long as your car, or as long as you KEEP that car anyway. Few are like me who keep the same car for 15+ yrs (and it was 10+ when I first got it).

Tina,
You change your oil so much, your engine should be very happy without magnets. I always assumed that metal filings too small to be captured by a filter would be harmless anyway. There is a magnetic drain plug which is supposed to catch heavy bits, pistons and valves. I wouldn't waste my money. Just tape a magnet on the outside of your filter and when you change the oil, take the magnet off and see if the filter rolls to a heavy side. :)

Klaus
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98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)