Well we obviously use batteries differently. I have at least 60 rechargeable batteries; a mixture of Powerex 2700 mah and 2000 mah so obviously I'm not opposed to use rechargeables. However, for my needs inexpensive Rayovac alkalines also work well. I typically pop four in my flash to power the electronics and use an external Dynalite Jackrabbit Pack II to power the actual flash. I shoot thousands of frames at events and I haven't depleted the alkalines. In fact, I'm still using the first 12 of the 48-pack I bought a few months ago.
This allows me to use my rechargeable in other devices like my Pocketwizards.
Alkaline batteries don't last long in most high drain devices due to voltage drop which is why i mix Lithium with Eneloop. If i use anything else in my Cybershot for example it will give me about 3-5 shots and the camera will shut off. Using 1.2v Eneloops will do the same thing as Alkaline and using strait Lithium is not cost effective at all. But mixing Lithium with LSD gives me the ability to save money and increase the battery life by preventing the voltage drop.