Well, that could be the only reason, Joss!
But do you think it wouldn’t smell nice otherwise? We never use anything in ours and don’t really know what it smells like except when we give the interior a clean, which I have to say is rarely. Then it smells of the cleaning products for a day or so.
I guess it’s like the house we live in. It doesn’t smell of anything to us, because we’re used to it. But I guess if we asked anyone else they’d probably say it had a distinctive smell. Probably best not to ask…