How can a £35 flight cost £105 and then some.....!!!!

need a little vent after spending hours trying to book transportation to southern France in august! you'd think it'd be fairly simple but noooo.
Firstly, last year i went on the Eurostar and TGV which was fast, cheap and fabulous. but you can't book further than 3 months in advance and it doesn't go that near to where we're staying this time.
Then investigated flying. there's only one airport within a hundred miles and only one airline flies there from the UK. (air france etc will do a connection jobby but that gets expensive and slow!) So we're left with Ryanair.

Used them a long time ago, know plenty of people who get on just fine with them but oh my god is the website frustrating! One flight a day, charges are per flight not per trip and boy do they add up.
Found an outbound for £15, a return for £20. bingo i thought. Oh but then after reading the terms and conditions, the thing had timed out and had to search all over again! Finally ticked ok, added some taxes (£45 worth!) and the £35 return is £80! But then we had to add the ryanair additions, taking it to £105! £25 made up of little numbers like £6 each way to take a bag. £3 each way to check it in, £3 each way to pay by credit card - and then to make it worse the second ticket went up by a tenner!!

then i discover parking at stansted is £8 a day minimum, this cheap flight isn't looking so cheap! specially for 3 or 4 of us!
So i started thinking about taking the mig, fuel plus tolls plus train/ferry could be similar cost methought. I went to drive-alive.co.uk and their route planner is genius! £36 tolls, £150 petrol each way.
allowing £150 for a crossing, I make it £520 to drive there which makes it cheaper than flying (just)!! probably take twice as long but still, it makes me think!
Anyone else driven to southern france and would recommend/disuade us? :-/