"I wasn't aware that the DS games had lower production costs"
The teams are much, much smaller on the DS. Your average "next-gen" title can boast more than 150 people, span several years development, and cost upward of $20 millions (i've seen worse). Nobody wants to gamble that kind of cash on an unproven/new idea. They were more creative back then because your production costs were basically a programmer and a gfx guy. It wasn't much of a financial risk.
"I wasn't aware that the DS games had lower production costs"
The teams are much, much smaller on the DS. Your average "next-gen" title can boast more than 150 people, span several years development, and cost upward of $20 millions (i've seen worse). Nobody wants to gamble that kind of cash on an unproven/new idea. They were more creative back then because your production costs were basically a programmer and a gfx guy. It wasn't much of a financial risk.