so having played Raid Shadow reasonably substantially for about 1 week here are my thoughts:
1. Currently DDO loading screens occasionally display words of widsom (eg press <SPACE> for swim). These COULD be replaced by flashsales screens linked to the DDO store to tempt gamers into buying stuff from the DDO store (there are huge amounts of flashsale adverts integrated into Raid Shadow)
2. Raid Shadow Events often have linked packs for sale. SSG could extrapolate by offering pack sets for events (eg crystal cove) that reduce the grind (eg 10 Stolen Amethyst for $10)
Regarding gameplay, you're kindof stuck with DDO. if you tried applying anything from Raid Shadow you could only have 3 fixed spells for your wizards...and those would be timed so maybe the wizard could only cast firebell every 5 minutes. We're actually lucky with the depth, breadth etc of DDO gameplay BUT...complex calculations (especially with a team that can sometimes include gamers from across the world for a single quest) result in tasty lag