It's easy to say "The money is there", but the fact of the matter is that the money is not there.
The NRA is funded out of donations made by companies which have a profitable enterprise going, and they know that their NRA funding is good for their bottom line.
There are all kinds of groups which advocate for gun law reform. They depend on purely donative - i.e. not financially interested - contributions, and they don't attract anywhere near the amount of money which the NRA has.
The Brady Campaign - named after Ronald Reagan's aide injured in the Hinckley shooting, has been around for quite a long time. If you look at their annual report for 2014, posted at their site, they received around 6M and change in donations and 6M and change in donated services for a total of around $14M. http://www.bradycampaign.org/annual-report
The NRA, on the other hand, runs on around $250M per year (for their various organizational entities, since, e.g. the lobbying arm is a separate organization from, e.g. their gun education arm).
I just wish money was committed to a new organization that actually promoted real reform, sensible laws along with gun safety for this generation.
Why a new organization? What, in your opinion, have been the flaws of the Brady Campaign that has been around for decades? If the answer is "they haven't gotten results" on less than 1/10 the budget of the NRA, then of what useful effect is dividing the pool of "gun control donors" between different organizations?