One of my holster manufactures recommended a product called Renaissance Wax which seems to work well at protecting the leather. Remember whatever you do the idea is to protect the leather from moisture and wear, but not to soften the leather. So, avoid products that are designed to soften leather.
A major source of objection to a free economy is precisely that it ... gives people what they want instead of what a particular group thinks they ought to want. Underlying most arguments against the free market is a lack of belief in freedom itself.
- Milton Friedman