if you were going to go to the considerable hassle of dry-aging beef, you might do that thing (with very large cuts) where you coat the meat in fat (dipping in rendered lard is probable easiest) and dry age it for many months, scraping and re-fatting whenever the layer of mould becomes intolerable. controlling the humidity is pretty important too; i think the thin coating of fat helps with this, though the ambient temperature has to be low enough that the coating remains solid.
what little is left of the meat at the end of the process is remarkable and worthwhile; no commercially available beef is dry aged for this long because there's too much loss for it to make any sense.
for meat dry-aged for a shorter time (the conventional couple of weeks or a little more), it's probably better, all things considered, to buy it from a butcher you like.