Buying gold Vs staying with CHF

I buy my bullion at Migrosbank. Was competitive compared to Degussa at last purchase a few years ago.
The buy-sell spread for 250g and up bars was about 1%, compared to around 2.5% at Degussa.

Beispiel (am 13.9.2016) Degussa Spread
1 kg Goldbarren 41052 42037 2.34%
500 g Goldbarren 20575 21096 2.47%
250 g Goldbarren 10287 10568 2.66%
MiBank 15.9.16 Spread %
Kauf Verkauf
20596 20796 0.96%
10296 10416 1.15%