You clearly don’t think YABU judging by your replies. 
You say you’ve don’t research by clearly haven’t.
Balls are not condemned by the RSPCA. A lot of people have different views but no animal welfare company have ever made a statement about them and ones they have made are taken back. It’s up to what you personally feel, if your ball is the correct size, 28cm minimum for a Syrian, then it’ll cause them no harm. If your hamster isn’t getting out enough then I recommend you get a ball whatever your views are.
If your hamsters cage is stinking after one day and they are biting the bars then they’re showing you they are unhappy and stressed. Bad biting is the number 1 stress behaviour.
You say no cage will ever be big enough but surely the bigger the better. There’s no point putting them in tiny cages and them complaing. The recommended minimum is 80cmx50cm but bigger is better.
Please rehome this poor animal to someone who will take proper care for them. Join hamsters UK on Facebook and you will find a new, loving, home straight away.
You aren’t doing enough to care for this animal or find them someone who will care for them.
And no matter what anyone says wishing an animal dead is vile.