I think advertising them on a Clio website restricts the audience a bit... Those who have clios won't want to buy clios... That makes sense in my head lol.
Joe public will look on auto trader, eBay, scumtree and piston heads at a push for a 'Clio sport' and probably wouldn't think to join a forum and browse the classifieds.
As much as I'd love a megged Clio, I don't think I could sell mine to get one... Just because I know my car and I don't know the standard of the conversion, so it'd be a gamble.
That said, if/when I sell the Clio and inevitably come back, as everyone does, I'd be straight on here looking for a boosted one.
litchy's and cro's boosted r27s are absolutely perfect, but I'd have to be buying a Clio rather than selling/swapping to have one of them