The real reason is that they have limited supply, and people want them. (people may not want bitcoin in the future btw) People always want gold and they want to gather as much as possible in their lifetime. It is the only solid asset which holds its true value through the centuries.
This is so true. The thing is, if it is limited the pice will rise. Just like in economy, if the demand will rise but the supply is out of stock then probably the demand that isthere will have a high price. And that is what's going on in the market of cryto and also in gold.
of course the main reason for getting profit. but I think gold is the best investment to save for a long time. well, whereas bitcoin is in a long time, but not as long as gold. both of these are used as a support for future profits.