But objectively speaking a strip steak is cheaper. Based on my observations of supermarket sale prices, the ranking goes:
fillet > ribeye > strip > others that I don't bother with (sirloin/round)
A filet is almost always more expensive than a strip, in the supermarket, at the butcher, or in the steakhouse.
Even as someone that has a dedicated dry aging unit, I don't know that I would recommend dry aging filet. I don't count the pellicle as waste, since I make use of all of it, but you do have to cut off a decent chunk - it's too tough to eat on the steak itself. The end result is that you just don't have a whole lot of steak left over.
You might see "dry aged" stuff for 2-3 weeks, and there's significantly less pellicle, but it's not nearly the same thing as something that goes for 60+ days.
I have a dedicated dry aging setup that I truss my subprimals up in, and then it recirculates air, including through a UVC light. I've never had any mold form, even on 120+ day dry ages. I haven't gone much higher than 120 days, though - I enjoy 240 day dry ages, but not in large quantities, and I also lack the patience, so you might see more going to that length. But in the 60 to 120 day range, however, I have never had mold form in any quantities large enough for me to notice.
Since it's so tender, I've always felt filet are OK to cook a little more well, and you solve for the flavor with sauce, seasoning, or marinade.
I do like sous vide for very thick steaks with some marbling—so a strip is a pretty decent one for the dip. However, I've found ribeyes come out spongey when you sous vide them and are better off being reverse seared.
Edit: if you're shopping in the supermarket, filets will usually be more expensive. If you're buying prime dry aged from a butcher, it's a different story, mostly because filets aren't usually dry aged. Check Pat's steaks for reference: https://shop.lafrieda.com/collections/dry-aged-beef