Was it the $2700+ back in Nov '03 for my new computer system? No.
Was it the $900 in (mostly) anime from Suncoast in Dec '03? No.
Was it the $600 - 800 four times over for trips to the get-together in three states? No.
Was it the God-knows-what on multiple trips all over CONUS during AT and deployments? No.
It was the $540 tires that I got, basically, down the road from my house that set off Visa...
So anime, computers, trips, and such all over do not seem to bother Visa. But get a set of tires right near your house and OH FUCK ILLEGAL USAGES YOU STOPPED!!!!111!
And my connections all buggy. Blargh.