I'm curious. If it wouldn't be indiscretion on my part asking... Could you give us an idea how much you sell (in percentage) of each format? Like: 40% Mobi, 30% ePub, 10% LRF...
Back to topic, I think you should support as many formats as you can. The more choice, the better. But if it's too much work, then I guess mobi, epub, lrf and rtf. I woud say PDFs as well, but I'm surprised you didn't sell PDFs at all.
I fully agree about any other formats who make it easier for people who have certain physical limitations.
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