Just for the record it was £5 for kids, £18 was the cheapest adult price.
Rugby League is a smaller game on the whole, attendances should be and are lower than football, they are different sports with different demographics and it is of no benefit to compare them (in fact only the football fans do).
Hull is considered a rugby city because we have achieved far more in the sport of rugby league than we ever have/will in football. It is an outsiders view that we are a rugby city, this isn't a slur on football, it's just a perception of the city as a whole.
Whatever your view is on either sport you should be proud that our (relatively) small, working class city can sustain three elite sports clubs, four if you include the ice hockey.
There shouldn't be this 'us vs them' mentality (I can assure you rugby fans do not feel the same way), I'm not saying you need to enjoy both sports, just appreciate that others do and that it reflects positively on the city.
You could look at it that both clubs got relatively poor attendances this weekend or you could say nearly 10% of the city turned out to watch their local teams compete in elite level sport, depends how miserable you are I suppose!