Yet, the idiom is true both ways, for high quality products as well as no quality products. I am testing it again myself in regards to motorcycle tires.
In about 22 months of riding I have watch Lady's odometer turn past 28,000 miles. Not too bad for an Ohio rider where there is only about 6 or 7 months of riding weather. But like many riders in less temperate climes, I ride all year, as long as the temps are above 25ºF and there's no ice or snow on the roads.
In the course of those miles, I replaced the original rear tire, an IRC brand 170/80 15", at about 18,000 miles. I put on a Dunlop K-555 of the same size and had to replace it this week after about 10,000 miles.
The K-555 cost around $120 and the tire I replaced it with is a Metzeler ME880 at a cost of about $175. I'm hoping I can get at least 45% more miles from a tire that cost about 45% more.
Of course, the trade off with a longer lasting tire, is a less sticky rubber and less traction. But since Lady is a cruiser that spends more time on interstate highways (my daily commute) than on a grand prix road course, I should be OK.