I run a 50c/50c game every other friday, so thought i would add in my 2c...
1) we do not do straddles. Usual buy ins are 60-100 and rebuys usually 100, so game plays big enough and we usually have 1500-1800 on the table by the end of the night, which is enough for a good competitive game but not too much to drive away casuals.
2) we do the tekashi 69 game, which is the same as 7-2 game, with $2 from each player to the winner. gets some good action and banter.
3) we have a high hand jackpot for each game - $5 from each player and best hand of the night wins the lot. All you have to do is show the best hand anytime after the flop and win the pot, so if you flop quads you still get paid if everyone folds.
4) i have 24 players on my text message thread, and usually book the game up a week in advance - key is growing the game and mixing in regulars with more casual off-off-in players.
I would say at this level, its about competitive fun, not harcore grinding nor hardcore gambling... so keep it casual and I have found the above rules help with both objectives. happy to answer any further questions...