This is not about "making money" i.e number go up. It, instead, gives Samourai Whirlpool users an option to deal with tx0 doxxic change for instance, which in the end is all about being able to spend money privately, non-custodially, permission-less-ly, without traces. Every tx0 change output can still be deterministically linked to your pre-mix coin history (source: https://docs.samourai.io/en/faq#what-is-doxxic-change). Every Monero transaction is untraceable and you can immediately spend it. So there is definitely a use case there, the same way in the opposite direction, a Monero whale seller may buy a bunch of different small tx0 change outputs and merge them into a new whirpool mix in order to benefit from btc's liquidity's market (as explained in https://bitcoiner.guide/doxxic/ on how to deal with change).

Saving in Monero for the future may incur in loss of purchasing power as Monero suffers from price suppression and exchange delistings due to it's anonymity enhancing nature but also users can still "save" it as a tool to spend in the future as the price has shown significant stability over the years nonetheless