If you're a game developer, what would you use to combat used game sales?

[binary solo]

Jeez man. There are plenty of games that make the developers and publishers plenty of profit that they all know what's required to survive with a used game market. Make quality games with good replay value and you will get enough new game sales to keep yourself going. Notice how it's the companies that aren't making much money and who put out crap games in equal measure to good games that are doing most of the whining about the used game market?

I don't mind making used game buyers pay a one off fee for accessing online gaming. Or having a "free" one use only DLC voucher for extra content. The one off online fee is to help cover the costs of providing the online service. The costs are covered by a few dollars coming off each new game sale to in some ways new game buyers are subsidising the online play of used game buyers. I don't think that's equitable. However I doubt the cost of the online service is $10 off the top of the new game price, because that would just about wipe out someone's profit margin. It's probably more like $2 per game (assuming reasonable level of sales). So charging $10 per game for online access is really creaming it I reckon.

Of course having compelling DLC is another way of getting revenue from used game buyers, through them buying one or 2 DLC packs.

Best I think to give people a positive reason to buy games new (free DLC or high quality+replay value) rather than being punitive against the used game buyer.