We have a Quechua 4.2 (our main tent) and have a vango dart 200 for overnighters.
We used for an overnight in Folkestone te night before we went on the tunnel to France, then we packed most stuff away the night before we left France, sleeping in te Dart so we could make a quick getaway in the morning.
Anyway, I like the dart, but realisticly, its too small - so I've just been and bought a swift reduced to £59.99 at Go Outdoors!
For the money you would get for the dart I would say it isn't really worth it - I mean, if you can pick one up for £30 brand new the second hand price is going to be stupidly low...
If you're genuinely not going to use it you could put it on freecycle - that's got to be better than letting it languish unloved in a dusty corner of your loft... poor old tent.
I do understand your vibe! We have a frame tent, an old-fashioned ridge-tent, a tunnel tent, two small dome tents, one-man backpacker tent and an ancient one-man canvas thing which the Famous Five might have used to eat seed cake in before discovering the mystery of the Smugglers' Cove! And a gazebo... and a party marquee left over from daughter's wedding... and a beach shelter...