I would like to point out that Monero has less inflation than gold does and gold has been used as a store of value for thousands of years. Even the World Gold Council says that gold inflates at an average annual rate of about 1.5% per year, where Monero is 0.8% per year and falling asymptotically towards zero. The inflation rate keeps miners mining the chain because they have an incentive to do so and it replaces lost coins through lost private keys.