I did this for years, and will start again now that we are back in the US. I have taken home a check for as much as $700 in one sale (sold a baby bed and a little tykes climber, among other things that sale).
I will never take my stuff to a consignment store. They offer very little and want only the absolute best of your name brand items only.
The church consignment sales, otoh, will take any item that is in very good condition, with no stains, holes, etc. You do work hard to have things tagged and organized, but it's a cathartic exercise for getting rid of things. I have sold all brands of clothes, from Lands End to
Walmart brand, as long as it's in good shape, and they also take things like sippy cups, bouncy chairs, bicycles, books - ANY children's item that is in good shape.
All you have to do is price well (I price 1/4 - 1/2 new, depending on the item) and you will make money. Plus, sellers get to shop before the general public, and people who volunteer to work the sale get to shop even before sellers. It's a great way to get started on a budget. There are some small fees involved besides the 30% sales price donation (around here, usually $10 to register and another $10-15 on supplies like ziplock baggies, safety pins, and hangers), but those pale when you realize you just netted $300 from your old sippy cups and toddler outfits.
Proceeds from every sale in our area (and there are at least 4 that I know of in the large city 40 minutes to our north and 4 in or near the smaller city where we live now), the proceeds go to children's charities or missions.