Moderate Oil Leak

I bought this bike a little over a month ago and have been riding it regularly since. I noticed that it had a small oil leak when I got it but the guy I bought it from said that it was less severe than it actually looks. I don't know anything about motorcycles as I chose this one as my first motorcycle. I come here for help because I think maybe someone here can identify this. Maybe someone has had the same issue before. It's a 2005 model and as far as I can tell is totally stock. My brother went to school for engines and he told me from looking at it, that he thinks the leak is coming from where the front sprocket goes into the engine? If that is so then why is the head and everything below it soaked with oil. The plug, chain, and chain-guard is soaked with oil, as well as the plate that is on the bottom of the engine is holding oil and drips. It is slinging oil back onto the tire a little and I am afraid it's going to cause me an accident. Please take a look at these pictures and tell me if you think that it is going to be worth getting it fixed. I have an appointment scheduled to get it looked at by World of Yamaha but it's not until the 20th. If it's not going to be worth it to fix it (money) then I'm not going to get it fixed. I only paid $700 for it and the guy I bought it from doesn't know anything about bikes either, so I think I got a good deal. It runs good and I haven't had any problems out of it except for this and the gear will sometimes slip from 5th down if I'm really giving it hell.