It is very unlikely that the cost to repair a used bike would be too costly. I purchased my r6 for cheap and spent 1,000 repairing it and was still better off than buying a new bike.
Sure, there is some peace of mind when purchasing new, but if you are price sensitive, then buy used. If you want some peace of mind, purchase it used from a dealer. Sure I could have it cheaper buying it from a private sale, however, I didnt want to waste my time dealing with people and their games.
Sometimes paying a slight premium is worth it. I did not have to worry about the following that usually comes with a private sale
1) Registering the bike
2) Sticker plate
3) Liens
4) Delivery/towing
5) Service
6) Availability
For me the value of the above is worth at least $500-1,000