Things I do not understand

Ceramic travel cups.

I walked into Papyrus yesterday and spotted these great travel mugs (I am weak to birds and horticultural images, I guess!) and then had to stop myself from buying one because I have too many cups and these cups are ceramic.

I mean, they must be for travel, because they've got silicone tops for spills.

Except they're ceramic, so a little bit of jostling and away the cup goes, smashed on the floor, rendering the top worthless. I'm kind of clumsy but I'm not especially butter-fingered, and I wouldn't trust myself carrying a ceramic mug while juggling a purse/briefcase/whatever else I'm carrying. Even just from my car to the office, let alone on the train.

So what purpose do they serve?

I've been seeing a lot of these ceramic travel cups lately. I could conceivably see it as "I just use the top to keep the drink warm for longer" because I do all sorts of things to prolong my tea's warmth, but they're sold as travel cups! For people on-the-go!