It sounds like a steal. Delamination can be repaired. Watch some videos on YouTube. I wouldn't hesitate to buy it if it checks out as described.
As far a maintenance goes: Look at difference in an oil change. Since you are doing it yourself, you're talking about 3 oil changes on a gasser vs 1 oil change on a diesel. More oil on the diesel but 3 times as often on the gasser. You'll also get better mileage, more power, much more comfortable ride, a lot quieter, longer lasting engine, higher towing capacity and a lot of other benefits.