You only have to see how far clubs like Forest Green Rovers and Burton Albion have progressed in recent years
There's a limit to how big they can get though as the fan base will always limit how much revenue they can bring in.
We have AFC Fylde about 8 miles down the road from Blackpool who have done well and are now in the Conference league North, the aim is to get into the 4th flight.
Quite a few Blackpool fans started watching them when we had all the "Oyston Out" protests going on as they refused to pay any more money to Blackpool and make Oyston even richer
Brand new stadium and decent facilities that most Div 2 clubs would envy but still only attendances of about 1000, the stadium was built by some guy who had tried to buy Blackpool but got turned down by Oyston however it's part of a retail park and I believe is possibly funded by some of the profits from it