There's been some questions about the selection of responses, my apologies if they seem strange. Here's my explanation:
In my 20 years of gaming, I've discovered that the main reason why people don't try a new system is because they don't want to spend the money on new books. At least, that's what people consistently tell me whenever I want to run a new system.
People told me this back in 1990s when I wanted to try MERPs, instead of 2e.
I got the same excuse with the coming of 3e, again with 3.5e (though I can't blame them--even I was annoyed with a revision coming only three years after 3e), and again with 4e.
(Heck, I got 'booed' for even showing the 4e books at a meeting, once--if you remember that thread).
Last spring I got the same reason when I wanted to run a 1e game--and I was like "WHAT!?! You can get the PHB for like $5 in some places!"
Overall, I'm just interested in what people had to say. Because I've found that an RPG system has more influence in attracting players than I first thought. As I've mentioned in another thread, I've watched a 20 player game ensue because the DM was great (though obviously incredibly flustered because he didn't turn people away).
This was back when 3e was first released and I joined a gaming club. While this 20 player 2e game went on I was down the hall in another room barely able to scare up players for my 3e. The DM of the 20 player game gave me the go ahead to syphon off some players. IIRC, he even vouched that I was a good DM. Back then I had 11 years under my belt as gamer--mostly a DM. I usually ran a weekly game. This didn't matter, people didn't want to buy the books to a system that they didn't like.
Heck, they didn't even want to try 3e.
Therefore, I sat behind a DM screen with no players and the DM with 20 players gained insanity points even though he wasn't playing Call of Cthulu. Eventually, he burned out and 15-20 players were left without a DM, but none of them wanted to play 3e. As a test, I offered to run a one-shot 2e game and I got players. Amazing.