Less valuable containers? Are you worried people are stealing them for the container? In 15 years of caching I have never heard of people coveting Lock n Lock containers or any container except an ammo can.
Im not saying people are stealing them for the containers. They are stealing them to be aholes. But why buy a $5 official lock and lock plus shipping, when I can use old Tupperware. Etc etc. I spent $20 on official caches which some of which got stolen within a week or two. Or I could use an empty pill bottle which costs nothing. That is my point. Just makes no sense to buy official geocaches when I can buy a pack of 30 geocache stickers for $2 and use cheaper containers laying around the house.
Just sucks that the "official" geocaches I bought were stolen immediately.