Surely that should depend on the tie. If putting in temporary seats is financially viable, by all means, but I don't think a club should be forced to shell out cash they don't have just because they've played well enough to get this far. I'd imagine there won't be a massive travelling support owing to the distance and travel/cash fatigue from the Harps fans, so they'd be relying on a big gate to cover the cost which isn't guaranteed by any stretch.