The more payment methods, the better. Although, I don't think that anyone is going to buy with bitcoin currently. You realize that he/she has to pay product's price + ~$7 in order to get the transaction quickly confirmed. If the fee was much lower I would suggest adding it.
Sure, the transaction fees are quite high right now... but my products are selling for about 100-150$ so it may even work.
You said online store right then I don't think the fees are big burden for you now because you can wait until the payment reaches enough confirmation even the transaction can be done with moderate fee to avoid extra expenses for your customer.