Hermit Crabs

My apologies if I'm in the wrong forum; I'm pretty sure this is the right one, but I didn't see a thread for one of my favorite non-mammalian pets - hermit crabs!

I fell in love with them at one of those mall kiosks when I was little; I was never afraid of them, even though I'm otherwise squeamish when it comes to things with exoskeletons. I had three in third grade, but the only clear memory I have of them was the day I brought them to school for show and tell.

Now, some fifteen years later, I have two hermit crabs that I bought for my nephew (but really for me). The larger one is named Magellan; he was a little explorer when I brought him home. The smaller, shy one was dubbed Sebastian.

I didn't realize how funny these pets are. Their water dish used to have little plastic trees, and Magellan would somehow end up on top of them. I bought some driftwood so he'd quit it, and now all they want to do is burrow. They drive my grandpa crazy with their scratching noises when they're active.

Anyone else share the hermit crab love?

Since I have kept aquariums, I have been looking for adding other creatures other then just the fish. So far I have snails, shrimps and of course fish.
I actually had the temptation to buy hermit crabs too. It sounds fun just by the idea of it. However, when I read a lot of reviews from the owners, many of them claim the hermit crabs are boring since they spend most of their time hiding in the shell and not moving at all.

From what you have experienced first hand, it seems to be quite the opposite of boring?

Where did you get your hermit crabs?
If I ever get them, it will be after I start a marine aquarium. All my current aquariums are freshwater.