My last dive trip with my film camera, I took 20 rolls of film with me at a cost of apprx. $65. When I returned those same rolls of film cost me $220 to have developed and printed. That's 720 pictures, half of which I immediately threw in the trash. Now I'm down to 370. Another half didn't make the cut due to bad composition, soft focus, etc. so that leaves 185. Of those there may be 2 or 3 suitable for enlargement for framing. Those 185 snapshots cost me $1.54 each for 4x6 prints. And I'll have the same expense, if not more, just in film and developing on the next trip.
Now with digital I don't have film but I have Smart Media memory cards. I pay about $50 per 128mg card and can get 130 pictures at HQ compression. I have the option to view and delete any or all of those pictures and try again. So by the time I get home, I'll have 130* good pictures. If I have all 130 of them printed at either the local photo shop or online with Ofoto or Shutterfly, I'll pay 50¢ each for a 4x6" print or $65 for the whole lot. If I print them my self, they are just a bit more expensive. The photos, up to 8x10's, that I have had printed from digital are equal quality to the naked eye to the prints I've had made from film. I don't count the memory card in the expense because it will be reformatted and reused over and over again.
Also with digital, I have a zoom feature, auto or manual focusing, among other features that will make taking those photos alot more fun as well as easier. I'll never be sorry I went digital!
*Actually I have four 128mg SM cards that I rotate. I download each days photos into my laptop in order to re-use the SM cards. I used 1 card as an example.