We paid (if memory serves) a little over $17K for our 2011 SD. I saw, just recently the same year and model (with all the bells and whistles, something we didn't get) for sale at...18K or thereabouts. So my ten year old camper hasn't depreciated much.
My neighbors next door have a big stick built 5th wheel. It's less than two years old and right now has a bright blue tarp over the front end of the flat roof. I am assuming (they're too nice a bunch of folks to sneer at) it's because the flat roof is leaking.
My Casita is "cozy" (a real estate agent's term for 'cramped'). When it's two of us inside, we do the Tiny Camper Tango, one sits, the other moves around. Add in one yowling Siamese and it can get pretty close in there.
My Casita doesn't have all the bells and whistles that a bigger, aluminum camper has...no slide out, no full sized refrigerator, no generator. No TV, no microwave, no oven.
My Casita didn't cost an arm and a leg, and it has maintained its value all these years.
I'm what my father used to say: "If you're happy with what you have, you got a good deal."