Re: Just sayin' 'no'
"Some people just don't get maths."
True, a single machine like that could replace several Pi 5s (more RAM, faster processor, faster storage and more built in) so you need to multiply the cost of the Pi 5's by a factor that is likely to be more than five to compare prices, so they would be more expensive.
OP has currently replaced them with a one to three ratio at the moment (so PIs would still be cheaper) but could increase the load a lot from there.