No, all rights are controlled by the publisher. The problem is that setting the book up for sale digitally through an actual retailer like Amazon is not as easy as it sounds--it's not like you just give them a link and then charge whatever you want. There is a whole infrastructure for payment and accounting and in hosting the book on Amazon there are large fees and charges that go along with it, so if you set the price attractively you don't make much money unless you do large volume of sales. Now, that's fine for me because I really don't have to make a penny, but an actual publishing company has overhead that has to be paid for. You could argue, well even if you only make a couple bucks a year that's still a couple bucks in the bank--except you have to do all the labour of converting and reformatting the book for digital distribution, setting up the accounts and then doing all the accounting for sales. So, I think that's one reason why my publisher has been waiting for costs associated with legit online digital sales to come down. The publishing business is a lot harder than people realise.
The best way to do it, financially, would be to just host the file on our website and set up a paypal account, that way you can set the price low and keep 100% of the profit. The only downside to that is that compared to Amazon and the like, you get very small traffic, and I'm not sure if Amazon contractually allows you to host the product privately while its on their site, so I don't know if you could do both. Personally, I'd rather just host it ourselves, just so it exists and all the people that ask about an ebook version have somewhere to go.