Yea I wouldn't class that as close to 50/50 to be honest.
You don't have to specify what you're spending the DLA on it's an acknowledgement/coverage for the fact that a person with a disability has extra costs - you may not realise what they are yet.
Eg for me I have ocd, agoraphobia, anxiety and depression plus a physical disability which limits my mobility.
I'm currently housebound so saving in some ways but spending more in others.
I spend way too much on cleaning products and toiletries as I clean things multiple times. I'm currently struggling with cooking/preparing food so buy ready prepped stuff a lot which is more expensive, everything has to be bought online and delivered which is more costly, that includes prescriptions which there is now a delivery fee for, I get through a lot of painkillers but also indigestion/stomach remedies to deal with side effects of meds, first aid stuff as I frequently bump and fall, muscle treatments to help with pain.
When I am up to going out and about I rarely can cope with public transport, sometimes it's the mental health side (I don't cope with touching others or crowds) sometimes the physical (legs are too unsteady to risk having to stand, pain is too bad to cope with crappy bus/train seating) so I'm better getting taxis which isn't cheap. I'll use more anti bac gel due to anxiety having to touch door handles etc when out or worst of all toilets with no bloody washing facilities! Clothes can end up thrown out because to me they're contaminated for some reason and need replaced, or if I have a fall or other accident I've ended up at times ripping sleeves, hoods, coats or wrecking tights/trousers - blood is MURDER to get out of clothes! I've learned to buy certain styles of clothes to avoid to some degree but that can be hard depending what the fashions are at time of buying - eg I had a nightmare a few years back trying to find a coat that had proper wristbands as I find loose ones too likely to end up either damaged or contaminated or even cause accidents, I tried with a loose one which caught on a door handle because I couldn't manoeuvre around the door normally due to the layout and ended up hurting my shoulder and elbow...
In short it's all the stuff able and healthy people don't even have to think about.
I have friends with other disabilities inc one who is wheelchair bound and one who has a prosthetic leg, also a friend with a child with a severe learning disability who hates being dressed/undressed but cannot do it himself - finding clothes that work with certain disabilities can be incredibly hard. And the ones that have been designed to do so aren't cheap.