Ryanair will certainly try to rip you off, and you have to pay attention to try to avoid paying for insurance/priority boarding/airport check-in/card fees. That said, assuming you don't have too much luggage (15kg ought to be enough for anybody) Ryanair will be a lot cheaper (particularly as you are flying oneway) and not too inconvenient. As another poster noted, the bus from FRA to Hahn Airport takes about two hours; you shouldn't need to spend the night unless you want to visit Frankfurt. Lots of people around this forum seem to think they are too good to fly Ryanair, but when you can find sub-€20 fares it is worth it and the service isn't significantly worse than a lot of "legacy" airlines these days.

Raffles: I've only had easyJet try to sell me lottery tickets; I've actually found Ryanair's staff to be much less annoying. At any rate, I see no way that avoiding a few small annoyances and inconveniences could possibly be worth spending €60 extra.