Depends though StevenF
Talking about single server to few server commits? Then getting prices that are crazy for colo and such. Much downside to such "no commits" like usually the folks have no control over the space they are in - shared with others... Switching in rack is whatever it is... VLANs and other switching stuff cannot do....
Fact is, anyone that is a "host" and is less than a few units + own switch isn't a real host in my eyes.
No self funded startup really is hitting these sort of buy in numbers. Great to future forecast, but.... Startups often out of necessity buy prior gen gear to get started.
E3 love?
E3 + 32GB + 4 1TB drives + BW + IPS ---- rental ----> $200~++ a month
Similar E3 bought: $700~ used/refurb + drives @ $70 x 4 = $280 = $1k~
12 months of the rental = $2400
12 months of the purchase = $1000 + $1200 for colo = $2200
These two are nearly identical.
At 24 months:
24 month of the rental = $4800
24 months of the purchase = $1000 for purchased gear + $2400 for colo = $3400
And is this a fair comparison? Per se. Because no guarantee of what the usage on gear you get in rental is going to previously be. You can rent the very latest to try and reduce prior wear, but you'll pay for that at top of pricing bracket.
Now all that is buying newish E3 gear, maybe v2 vs. v3... Little stuff that in big picture isn't very different.
Or you could go prior generation stuff and spend < $2000 for a nice quad board setup with more cores and more RAM - 3X... Throw another $70 x [drives needed on top 16 @ 4 per] = $1120
= $3200 total or $800 per node.
Numbers really matter more when buying brand newer stuff and comparing to rental.
Rental is a ripoff unless you are renting from outfits like the guys in Buffalo who don't mind selling at near cost (low to no profit margin) to gain market share.
RTO that few offer is a better option and that's where you can bring your own drives in versus getting gouged by facility for theirs. RTO gives them during pay period liability for hardware. To me, that's the hybrid n00bs should be looking at if entering the market place. n00bs with some prior experience should be looking for entire racks and stacks of servers out there for extremely low cost per unit that is prior gen stuff.