Hrm.... Is it their obligation to release products for every single platform? Do they have things for the Wii as well and, if not, do people expect Wii specific peripherals?
Ultimately, if it's a market that has demand and they're not capitalizing on it, they lose out on they money they would make from that market, and leave it wide open for someone else to swoop in. I think it's a bit silly to not release products for the PS3 as well but, really, not my concern. I think it's silly that MS took years to get an Office suite out for Apple and we are still waiting for an Android one and, go figure, significant Office clone programs have taken foothold on those platforms for their tardiness. You snooze, you lose.