I bring loops with me everywhere I go and break them every so often. That is just the opinion of the guy in Calen's story. I certainly don't agree with it.
A little more information for anyone who's interested:
As I'm sure you've heard, with practice you can get tons of use out of them. There are many ways to make them devilishly practical. Check out Mesika's wallet credit card carrier. I have loved using it for years. You can easily invent your own system for carrying loops too, I've seen a few people that made their own systems (sometimes using playing cards) that work just as well. Unfortunately he doesn't sell the accessory separate from his one of his DVD sets but if you are new and interested in loops, it might be worth purchasing the whole thing.
I would recommend trying a few different loop packs that come pre-made pre-made so you can see what they should look and feel like when they are well made. If you find that you enjoy using them in your performance style, you can learn how to tie your own and buy large spools. I tie a ton in bulk every so often while watching a movie. The million dollar knot method from Penguin Magic is efficient, but there are a number of free resources (arguably better) out there if you search for them. As far as threads go, there are plenty of good options to choose from. I have 2-3 brands that I switch between depending on what I'm using it for. Some are better for certain effects, so I usually carry a variety of them with me at all times. Key factors include thickness, strength, reflectiveness, loop size, and susceptibility to picking up dust particles over time. Just like playing cards, each brand typically has its own strengths and weaknesses.
Loops are still a leading technology in magic. They aren't perfect, but their potential impact is more than sufficient to justify investing your time in. They are fun to use in the right moments, and people remember those effects forever.