Batteries or no batteries?

I’ve run into a few project lately, Casualty 4 and Sunking, that fit in a B sized box, but leave no room for a battery. This has me rethinking the battery as a power source. To be honest I use batteries almost exclusively. I rarely use a power supply. The reason, I don’t own a decent power supply. I have a single 9v wall wart from RS. Which works fine but has a terrible ripple.
I do admit I also throw away a lot of batteries. It would be nice to not be producing the extra waste.
It would also be nice to not have to buy batteries. 9V batteries are fairly expensive. I look around and can find them for about a buck. Though, a few weeks ago I bought two at this dollar store on Divisadero St. and they were both dead when I opened the package!
What do people expect when they buy an effect? Do you expect it to use batteries and a power supply? How do people feel about effects that don’t have the battery option?