Well.... each to their own and all that. If this type of thing is what some people are into, I wouldn't knock them for it. After all, if they all suddenly started turning up in droves at the smaller and cheaper races I prefer, I'd probably be a bit peeved.
But yes, some races just seem to cost waaaay too much. That's how I got into ultras this year, after comparing the £48 fee for a marathon with the £13 fee for a 33 miler and the £17 fee for a 40 miler.