Well they definitely aren't as sturdy as self tipped tie that's for sure, and that's why I don't make any un-tipped grenadines unless special ordered, they just stretch too much with the lesser structure in them. But they do make for a great lighter weight summer tie in linens, printed silk etc and help keep the weight down on heavier weight fabrics like shantung.
But the average non SF person buying a tie from a store doesn't get un-tipped ties that's for sure.
IMHO tipping your grenadines (especially finas) is an excellent decision. Grossas I don't mind so much either way.
Wool and cashmere untipped, though!