Fake confessions are really one of the meanest things people under the pretence of a joke. Somehow that made me empathise with him a little more even though he was quite unlikable at the start.
Rina probably is beyond help at this point. Its like cocaine, when you get hooked it isn't easy to backout unless someone comes along to save you.
That said I believe money is never the solution. Oh you have this situation? Let me pay for everything and you can be free! What Yuki did, telling off Souta by asking him to use his own hard earned money was the right thing.