Apologies for over-posting in this thread, but the gaming DAC is a very lucrative area and one I'm quite interested in.
Sorry, this is slightly dated, but if you look at global gambling revenues, you can see that
lotteries have the biggest share at 28.4%.
However,
online, the big winner is betting at 40.6% of total market share. 
So I think
long term the Betting DAC and the Lottery DAC will be the big winners. (You'll also notice that online lottery's shrink from 28% to 13% market share, this to me represents a real opportunity, IMO the dominant decentralised lottery will eventually trump all regular lotteries, (because it can offer up to 2x better odds and have a GLOBAL player base = HUGE jackpots.)
---------------
I had a quick look at the Bitcoin gambling thread -
https://bitcointalk.org/index.php?board=56.01. It seems there is a lot of 'noise' and no clear market leader in many fields.
ATM Dice is by far the most popular Bitcoin Betting game (by # of bets.)
'Listing Betting Sites Total # Of Bets'
https://bitcointalk.org/index.php?topic=529963.0(8/9 of the top 10 are dice games! Also Satoshi-Dice is not on the list but I'm sure they're no.1 by a long margin.)
1 JUST-DICE.COM 978,889,464
2 PRIMEDICE.COM 562,719,050
3 DOGE-DICE.COM 411,685,597
4 DICENOW.COM 346,409,188
5 DICENOW.COM 209,807,916
6 COINROLL.IT 63,332,606
7 DICEONCRACK.COM 47,389,035
8 SEALSWITHCLUBS.EU 21,809,533
9 ICE-DICE.COM 14,675,117
10 NOBLEDICE.TK 13,057,954
----
Looking at the other games, despite being supposed 'provably fair' games there is a lack of trust.
(Many first page threads are dedicated to discerning who is trustworthy -
'Ratings and Reviews of all the bitcoin sports books'
https://bitcointalk.org/index.php?topic=448302.0'Creating a list of gambling sites we can trust'
https://bitcointalk.org/index.php?topic=561428.0'Fucking ponzi's..'
https://bitcointalk.org/index.php?topic=510323.0In my opinion this is FANTASTIC! There are no/few market leaders and what the market is really calling out for, is not only 'provably fair' blockchain games but from
a trusted decentralised source. That is exactly what the Bitshares Brand can offer! A brand building a reputation in a bunch of much larger areas wouldn't want to risk it on a dodgy gaming DAC. So
Gaming DAC's bought to you by Bitshares and endorsed/verified by the likes of Bytemaster can easily dominate here. This is perhaps why only something simply verifiable like Dice has taken off so far? My understanding is that things like Roulette, BlackJack and Slots are the easiest to implement? Personally I would start with something easy and get Bitshares toe into the water as soon as possible to start building trust, brand recognition, reputation etc.
----
LotteryAt the moment there is no credible lottery, there is a lotto coin,
http://lottocoin.org/Which is ridiculous. It pays out coins to miners in lottery form - miners are people trying to get a consistent return on their rig investment they're not lottery players. (The clearest example of this is the mining pools in Bitcoin & other coins - if you wanted to play the lottery as a miner you'd just solo mine for coins, miners are trying to earn an income not gamble.)
There are some other vague attempts but nothing a Lottery DAC backed by the Bitshares Brand with a good interface couldn't steamroll over in less than a few weeks.
Sports/betting Bytemaster has some great ideas & Truthcoin
https://bitsharestalk.org/index.php?topic=3916.0 might be an option.