I did that a while ago and stopped immediately because it's scary and irrelevant. My parents house was wrote expensive at the rule they bought it at 600.000 Bfr. Now it's being valued at 600.000 euros. That's a factor 40 over about 30 years. When euro landed a beer cost about 45 Bfr, a bit over a euro. Now I pay €2,5. It's hard to compare prices over that period of time.

This feels odd to me. The only people I can really see doing this is ones that were 70+ when the Euro was introduced.