I agree with fm1234, put it on disk and sell as a 'bundled system'. By that I mean offer several items relating to the same subject on the disk.....
As far as why your competition is selling more that you are,,,,take a look at his listing and see what he is doing different than you....What type of discriptions,, benefits, and such to make the sale...You need to have good sales copy to intice your potential buyer into action,,,some good words to make them want to buy your product right now...Give lists of benefits the product will have for them,,problems it will solve for them,,,time it will save them,,plus throw in some free bonuses to sweeten the deal.....
These are the things that make one seller sell more products than the other seller with the same product....