Hmm, my guess would be that most cachers would either try to make their own containers or to use the "normal" ones. With your containers, one would be more or less "forced" to make a nice themed cache out of it. Don't know how many would actually do that. Selling them online is a great idea, though. Giving them to friends in the area would result in too many similar caches, for example.
As for the price, people would go for the lowest one, of course. But as they are unique, I totally understand your pricing. Maybe it's worth a shot! Personally, I LOVE that idea of unique and handmade containers!
Btw, on Friday, a friend of mine and I will do this cache:
https://www.geocaching.com/seek/cache_details.aspx?wp=GC3P6WGThis is a file that you have encrypt first (mother tongue doesn't matter - can you find it out?!):
https://k005.kiwi6.com/hotlink/kssa8rm916/geheime_Uebertragung.mp3 The owner already 2 similar ones, so it was not too difficult to know what to look for, but had quite a hard time finding out how to deal with my idea.