I lived in Lincoln 10 years ago, good place and a fun night out, with a few distinct parts of the town with different atmospheres, that we used to call the top, middle and bottom. Never went to a Lincoln game but their fans seemed to be fanatical and not critical at the time.
Not surprised on their fan base being from miles away, Lincolnshire is quite big, and spread out, just little villages dotted all over. I was actually living near where I worked, but moved to lincoln 25 miles away for some nightlife. 25 miles of driving through country roads every morning in winter with glaring sun as there's no buildings or hill for shade!
People don't realise how small that place is, the population is only about 80,000 and has no other towns of similar size or larger within an hours drive, it's like it's own little world.