Fair enough re Frankfurt. I wouldn't want to go to Hahn either. But Frankfurt is an extreme case.
I'll give another example. Krakow. RYR flight leaves at 6am and gets me into there at 9.30 in the morning. EZY fly only in the middle of the day - this is a business trip so as you say, time is money. No-one else flies direct. If you want business class, its the Luftwaffe via Munich or Frankfurt. There is no closer Krakow airport to the city centre.
RYR are therefore the only airline offering the product required. Would those who "despise" the product waste their own time and money to avoid? For what is a perfectly safe operation, such a decision seems irrational to me.