[tomgallard]

You say you cannot increase costs because of competition? Are you sure about this? I understand its scary to price yourself above competitors, but that doesn't mean you can't do it.

For example, the software I sell is more expensive than all of the competing products. However, I know that as we have similar fixed costs, I only need to sell around 1/3 the volume that they do in order to make a similar profit. People don't always go for the cheapest option- indeed most people avoid it.

Until you've tried raising your price you really don't know what you can get away with (and I think you may be surprised, especially if you're getting people coming to you via personal recommmendations). Companies like Apple have made enormous amounts of money selling products which are more expensive than the competition.

This doesn't address your scaling concern though. Are there parts of the process that are automatable? For example- could clients preprepare their app in a certain way that makes it easy to extract and translate all the data.