I don't think there's an enormous demand outside student hippy shops - it's the sort of thing people bring back from holidays but don't buy much if they haven't been to the place it was made.
I have quite a lot of framed and mounted batiks I've picked up in India, Sri Lanka, Indonesia, Malaysia, Mozambique, Swaziland but very few I've bought in the UK and then mostly from second hand places rather than new.
If you want to sell to shops, you'll probably get better prices if you can mount them on stretchers (like a canvas would be mounted) so that the customer can hang them straight on the wall - selling unmounted means most people are nervous about what it's going to cost them to get them framed or stretched or they buy them and leave them in a drawer for years.
Personally I don't like the Indonesian style very much but I'm sure it appeals to many people.