This is a good move to target Bitcoin holders.
However I have a concern, how do you handle the risk of refunding Bitcoin in USD? The BTC/USD rate will surely move from the date of sale to date of refund.
Example
Date of sale 15 Oct 2017: 1 BTC = USD 6000
Date of refund 25 Oct 2017: 1 BTC = USD 6500
In the above example, you receive 1 BTC for a USD 6000 sale. But you are refunding USD 6500 for 1 BTC. On the other hand, if BTC weaken against USD, the customer will be suffering losses of USD 500.
Currently this is very serious concern for many and they are not taking risk with bitcoins otherwise its going to be rock around the world very quickly hope we have some good solution for this also in near future and then we can use this without any serious trouble around the world for any thing