I'm still trying to get the kids to use rechargeables more. Seems they only want to use them when there aren't any non-rechargeables left. Also, some of these toys can take 6 AAs, which means two charging cycles with my charger.
If you have kids you would have to have some kind of system for Rechargables and they would have to be taught about them, which would require them to be old enough to at least comprehend things. Also sometimes there are so many toys that you couldn't possibly have Rechargables in all them without spending a fortune and losing some batteries and if they are lost that would be bad. I would suggest getting a bulk pack of alkalines for these purposes, obviously in the more high drain toys or more expensive toys that you intend to resell when your kid is done with them I would put Rechargables in those but otherwise most toys won't eat through even one set of eneloops in the lifetime they will be used. So it's definitely not wrong to use alkalines in some applications, especially if its throw away toys. They have bulk packs of batteries on slickdeals often and you can get them at places like the Home Depot, if you don't have Sam's or Costco memberships.
My cousins didn't have problems with batteries when they were babies, and they had a baby swing that took D batteries. But of course everything is more expensive now than when they were young enough to use a baby swing. Now they have a Wii, and a million other gadgets now that the kids are older and I give them 20 alkalines and they are gone in a couple weeks. I can only imagine how much they are spending on batteries, and I see them with the expensive little packs of batteries too.