4btc? I don't know how much the original price of that buggy but I think 4btc is cheap. If I have enough BTC in my wallet I would definitely buy that one.
I just checked that new buggy costs about $20 000, so 4 BTC for not much used buggy is great price I think. I imagine it's fun to drive this buggy in off-road looking from video. OP, I hope you will find buyer, good luck!