I think you also paid a €30 pre-registration fee although this was taken off the final cost (€110 in 2011). Ah yes, found my receipts.
I then bought a gilet (€20) as it wasn't included back then, pre-ride meal (€13), jersey (€30) and a camping space (€10) that I didn't use.
I also paid €30 and €39 for cheap F1 hotels the night before and the night after (didn't use the one for the night after, too scared I'd oversleep as I had an early flight the next morning, just slept in the airport terminal).
£156 for flights LHR<->CDG including bike as extra baggage coming back. Can't remember how much the RER/Metro was between CDG and StQeY and vice versa.
A chunk of money to filthy to take my bike over to Paris for me in his van as I didn't trust BA (didn't care if they damaged it on the way back, they didn't).
Probably €150 in food/beer before/during/after the ride.
So the ride itself was 1/4 of my costs (it's probably cheaper if you don't fly there/back, or if you camp).