This is incorrect. Example: a S19 Bitcoin miner costs currently $10,000 and performs with 100THash/sec and pulls about 3200 Watt (a bit more than advertised)
Let's say you would invest the $10K today in BTC , that would give you 0.2 BTC which would appreciate in price over time

After deducting the electricity your miner would produce only 0.00052684 per day

let's assume the difficulty would stay the same (which is not realistic) you would need to mine for 379 days until you break even and make your 0.2 BTC.
In the meantime you have to deal with cooling, noise levels and maintenance

And this is the best case scenario with one of the best BTC miners. If you have a lower performing model, it will take exponentially longer to make your money back - if ever.
So no, if it was for the pure investment purpose you are better off buying the currency directly.

Miners want to support the network, helping to keep a stable decentralization and in return they are getting some rewards. It is a different philosophy