Moira Allen and Writing World has a little article laying out the differences between subsidy publishing and self-publishing that is worth a read – even if you are already pretty solid in the difference.

Just one of her considerations:

2. Will I receive royalties or all sales proceeds? If the answer is “royalties,” you’re dealing with a subsidy house. Subsidy publishers pay authors a standard royalty of around 10-15% (which may be based on the retail price of the book or upon a discounted price). When you self-publish, you receive all sales proceeds (although this does not necessarily translate into profit).