If you haven’t already bought these reservations and are willing to extend your journey time it is possible to greatly reduce these costs.
Direct France - Switzerland TGV Lyria trains have these ridiculously high reservations, particularly in 1st class.
You can avoid this by travelling on TGV inside France and connecting into Switzerland on other trains. Domestic TGV are either €10 or €20 per reservation, Regional connections France - Switzerland and regular Swiss trains have no fees and no need for reservations at all.
Post up your itinerary and we can assist with an alternative route.
There are a very small number of routes with high reservation fees, you have found the very highest. In general High Speed trains from France to neighbouring countries are the biggest offenders. In nearly all cases it is possible to avoid these with some willingness to be flexible and use alternative slower connections.