You totally jinxed them! You’ll probably have three of them fail in the next month. ;-)
I decided to do verifies once a month, instead of the default once a week. My thinking was that hitting all of every drive so frequently might be a wear factor, but periodic scrubs are still important; plus, for my larger arrays, having performance slightly degraded 1/7 of the time was not so desirable. So now I do 12 verifies a year instead of
52. I think the verify has picked up maybe two errors in ~10 years.
(It does sometimes expose when a drive is failing, which is handy.)
The LSI MegaRAID cards have their own scheduling, and I haven’t had time enough to read the manual to figure out how to set this (or indeed, even to figure out what the schedule is; the MegaRAID UI is much more arcane than the 3ware).