$15 is not exactly zero, is it? If you don't need more than 1GB, why pay anything for more than 1GB?
I recall running LAMP stacks on something like 128MB about 20 years ago and not really having problems with memory. Most current website backends are not really much more complicated than they were back then if you don't haul in bloat.
It is. With 10k MRR it represents 0.15% of the revenue. Having the whole backend costing that much for a company selling web apps is like it’s costing zero.
You probably don't make 10k MMR on day one. If you make many small apps, it can make sense to learn how to run things lean to have 4x longer runway per app.
The runway is going to be your time and attention span, not $10/mo.
I don't know what you value your time or opportunity cost as... but the $10/mo doesn't need to save very many minutes of your time deferring dealing with a resource constraint or add too much reliability to pay off.
If resource limitations end up upsetting one end user, that costs more than $10.
Given how much revenue depends on the experience of a web app and loading times, I’d be happy to pay 100$ a month on that revenue if I don’t have to sacrifice a second of additional loading time no matter how clever I was optimizing it.
if the project already has positive revenue then arguably the ability to capture new users is worth a lot, which requires acceptable performance even when a big traffic surge is happening (like a HN hug of attention)
if the scalability is in the number of "zero cost" projects to start, then 5 vs 15 is a 3x factor.
I recall running LAMP stacks on something like 128MB about 20 years ago and not really having problems with memory. Most current website backends are not really much more complicated than they were back then if you don't haul in bloat.