AFAIK there are very few cases when user send Bitcoin to wrong address or spend too much on fees and got their Bitcoin refunded.
I've heard of quite a few cases, so unless you put effort into making a well-sampled poll, you won't know what are the odds of getting the bitcoins back.
And if someone has sent bitcoins to a wrong address, that's also often rectifiable if it's someone they know well enough, or a non-scammy cryptocurrency company (exchange, gamblign website, whatever), you just have to contact them. It's not the same thing as sending to 1BitcoinEaterAddress(...).
Fair point, but AFAIK those company don't bother unless big amount of money is involved (usually due to security concern) or user are forced to pay small amount of recovery fees.