You forgot to mention what year the bike is. And we need to know what size it is. These are very important to whether it is worth it. Repair cost will differ. Don't trust in advise that doesn't have all proper information taken into consideration.
Just a side note. I had a 89 Chevy Beretta that I kept at my house after I got other cars. It was going to be a derby car, but never got around to converting it over. Anyway, it sat for over a year in upstate NY. I didn't do anything to store it, it just sat. So when I went to get it going again (needed a winter car) it cost me $35 for a new battery. That's it, it fired right up. I filled the tank up and just drove it. It is a V6 and is pretty high in mileage. The point is, the time it sat may not of had too much effect. If there is no visual rust/corrosion on important engine parts it may not be bad. But whether it is worth it, I stand by my original statement.