I think with the disorganisation you describe ebaying stuff right now is only going to hold you back. The time sent listing could be spent decluttering. Unless its a big ticket item your time could be better spent?
We've had to politely say 'no' a lot over the years.
I too find it disrespectful when family go against our wishes (They don't often.)
I've heard that gift giving is some people's expression of love but if you had the discussion time and time again, I think wishes should be respected.
I've been very open about how much stuff has gone to charity over the past years too so I think family know stuff that is not needed will be 'binned' (Basically sent to charity/recycled etc
I have a white Ikea recycling with a flip open lid at the front which all the shoes get thrown into which works well, we're a family of four. I prefer them to be hidden rather than on show as our front door in our cottage opens straight into our front room, we have no porch/entry way.
I'm not sure love, I've never actually tried one before, I don't even know if they've available in the UK. I have read about how toxic regular mattresses can be though, although I've read Ikea mattresses tend to be better than most if that makes sense?!
Are you going for regular height beds or low level beds?