Originally Posted by dcfcsteve
It's not necessarily through lack of ambition - it's a simple risk-benefit analysis. Big downside with little upside in return.
The outgoings would be high. Any new club looking to come-up would have to spend a lot on its facilities. It would then have to spend further on it's team. And then it's travel costs would be higher than ever before, before you add-in other match-day costs like stewards/security, accommodation etc.
Meanwhile, the income from joining the league would be much smaller. Crowds in the first division are poor - particularly for unestablished teams - sponsors are hardly beating a path to anyone's door, and the chances of achieving anything other than mere survival for quite a few years would be slim. Therefore - you'd be unlikely to win anything, particularly promotion, for some time, which would limit both your income and crowds still further.
Most clubs would weigh up both of the above and come to the conclusion that it's just not something they could financially risk doing for their club. It could easily lead to the death of a club if not done properly.