SteveC said:Let me make an addendum to this: you can also use a totally different system and be successful if you're bringing a large number of new people into the market that don't have preconceived notions of what a popular system is.
However, in these cases, I think it's still a good idea to use the OGL if you can, because you can get your new blood in, and also attract your existing market.
--Steve
This is undoubtedly a very tough market to make a living in, esp. when you realize how much of the market is totally dominated by WOTC. Most people who'd likely see your "hot off the press" game system are already familiar with D20, so do you put your eggs in the ("buy us, were familiar D20 basket") or the ("if your bored of rolling a D20 where different") basket. And then there is the nastalgia basket (like Hackmaster and OSRIC). If it were my money on the table, I honestly can't say which way I'd go. THough I think the wind is changing, and people are getting bored with D20. It'll be interesting to see if 4E keeps it.
Also, you have to consider the possibility that there are real differences in the results produced by each general system type: D20 vs. Tables (as I brought up in another thread) or other systems. If you want your game to have a certain feel this needs to be considered (quick and easy, complex and drawn out etc.). For instance, battles take slightly longer roling d1-100 (using 2 dice) then a single 20 sided (having to wait till both dice stop and then read them). If you want to produce a certain experiance, it might matter which system you use.
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