At $2-$3 /round for .260 factory ammo, you'd be nutz to buy a rifle chambered for that unless you handload.
Supply and demand at work...
You can buy FGMM and Black Hills in .308 for $10-$15 less per box than .260...
They charge more, because they manufacture far less.
There's only a handful of "match" .260 factory loads. If your rifle doesn't like any of them, you're screwed. That's why the .308 is often the best choice for those that don't handload (though if you shoot long range, there's no excuse for not reloading)