Allright, I am in the same boat as others..seeing as I do not usually charge for my cakes either.

However I have a 2nd cousin who is getting married and would like 4 separate (1 tier-2 layer) cakes..10" x 3"each and each with a different design (all fondant covered) but all cohesive.

My question is: what the heck to do I charge for this?

Sorry to sound 'inane' but I am at a loss here..

Thanks for any input!

A very simple way of working it out is to add up everything it's going to cost you (including electricity, water, gas, parchment paper, and things you already have in your pantry). Then consider how long it's going to take you and what you want to charge per hour. Because she's a relative you may want to consider, what we in Australia call, 'mates rates' ie a discount for friends!!
Good luck

Just to give you a jumping off point and to get you started .......

A 2-layer 10" cake serves 38 x 4 cakes = 152 servings.

Determine your price per serving. Mine for fondant is $4.50/serving x 152 servings = $684