For a good many followers "they don't care" about how their team are performing..
They will still attend as the sport is pretty much down to its die hards in many places, and many of them will attend, primarily, to watch the racing...
You can't take it too seriously given the operating model used, therefore, many of those who attend will return the next meeting regardless of result..
Poole are very much an outlier as their crowds do shift significantly depending on how the team are doing, (which is magnified more given the higher crowd level starting point)...
Hence the Ford's dropped down as they saw that the higher costs of tier one didn't guarantee a successful season, and an unsuccessful season, impacted their business. and, in tier one, that would be a much more expensive unsuccessful season...
Their business model is pretty much perfect for UK Speedway, keep winning and their crowds will remain strong, and plenty of tier one riders will be on show every time they race, but at tier two salaries...
They also seem to actually promote the sport well locally, which, again, is a bit of an outlier when compared to many clubs...