I was in the business of furniture restoration for several years, I gave it up because people just don't appreciate their furniture as much as they used to i.e. just won't pay for it to be done any more.
Its possible to go out and buy a badly constructed chair that looks good for a year or so then when it starts to go a bit wobbley, then its time to go out and buy more new chairs.
Since 99.99% of these chairs are machine made, and imported the craft and skills to make them is being lost.
I think €150 to strip your chairs is not too bad a price for the job, speaking from experience I would have charged you more than that but I'm glad you are keeping your chairs. I think its nice when people appreciate their furniture.