I was interested in selling on etsy at one time so I started tracking what actually sold -- you can look that up under the seller's profile. Most of what sells on etsy are small Quilted Items like table runners, placemats, coasters & some tiny wall art... items in the $5-25 range. Of the quilts that do sell, they're almost always $50-75 (usually $50) and some of the quilts at that price are Queen or King sized quilts. The ones that sell tend to be hand quilted and many were also hand pieced. Personally, when I added up the cost for me to make a crib sized quilt (I do all hand applique & embroidery, but FMQ by machine), I could barely cover my own costs for a small crib quilt at $50 (fabric, batting, thread, needles, electricity to run sewing machine & washer/dryer ... plus wear-and-tear on other items that eventually need maintenance/replacing like pins, rotary blades, markers, my machine) much less make any money. Even if you were able to always buy the cheapest fabrics & batting on the market at 50% off, you're still looking at a minimum of $20 just for the basic items ... probably $25+ when you add in items that need to be replaced over time. So that leaves, at most, $25 for your time. Can you really cut, piece, quilt, bind, wash, market & ship a crib quilt -- even entirely by machine -- in 2 hours or less? Because otherwise you're better off applying for a minimum wage job. And that's assuming the thing actually sells when it's competing with items that people hand quilted & are selling for the same price.
If you still want to sell on etsy, go for it. It's not as bad of an option as other large online marketplaces. I've just personally found that other options like selling it at a quilt show, working with a more local merchant who only sells quilts (and takes a smaller cut of sales than etsy), or promoting it on my own tend to be MUCH more profitable than etsy every would.