The most important benefit of accepting Bitcoin i could think of at the moment is the fact it's like an payment with possibility of more profits. Let's say if I have received $10000 as a payment and in a week the akue f Bitcoin increases by 10% then I would have $1100 if I hodl it.
But I strongly object to your point saying it's cheaper than western union, I think you should check the transaction fee during bull run or when Bitcoin's value is higher.
Aside focusing on one direction you need to also note that, Bitcoin can be in sideways or dump movement within some few hours, so it can cause loss to its trader after receiving Bitcoin as a tender for payment.