I work a minimum wage job that quite often makes me work when Everton are playing, and my ST is more than half a months wages. If I can sell the tickets I'm not using to get a bit of money together then I do.
Maybe he realises he's going to find it more difficult to get into the team next season and just thinks it's now or never to play CL football. It's likely the only way his stock will go is down.
Lukaku's obviously the better striker but I don't think the main reason Duncan is a cult hero is because of his goals, it was because of his personality.